SKU: 25901008334

Human FOXP3 ELISA Kit

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Description

Human FOXP3 ELISA KitProduct Specification Usage Required experimental equipment: 1. Microplate reader (450nm) 2. High precision pipettes and pipette tips: 0. 5 10uL, 5 50uL, 20 200uL, 200 1000uL 3. 37C incubator 4. Distilled or deionized water Sample preparation and requirements: Tissue homogenization: Rinse the tissue with pre chilled PBS (0. 01M, pH 7. 4) to remove residual blood (lysed red blood cells in the homogenate will affect the measurement results). Weigh and

Product Specification

Usage Required experimental equipment:
1. Microplate reader (450nm)
2. High-precision pipettes and pipette tips: 0.5-10uL, 5-50uL, 20-200uL, 200-1000uL
3. 37°C incubator
4. Distilled or deionized water

Sample preparation and requirements:
Tissue homogenization: Rinse the tissue with pre-chilled PBS (0.01M, pH 7.4) to remove residual blood (lysed red blood cells in the homogenate will affect the measurement results).
Weigh and mince the tissue.
Add the minced tissue to the appropriate volume of PBS (generally a 1:9 weight-to-volume ratio, e.g., 1g of tissue sample to 9mL of PBS.
The specific volume can be adjusted according to experimental needs and recorded.
It is recommended to add protease inhibitors to the PBS) in a glass homogenizer and grind thoroughly on ice.
To further lyse tissue cells, the homogenate can be sonicated or repeatedly frozen and thawed.
Finally, centrifuge the homogenate at 5000×g for 5-10 minutes, and collect the supernatant for analysis.

Cell Lysis Buffer: Adherent cells should be gently washed with pre-chilled PBS, then trypsinized and harvested by centrifugation at 1000×g for 5 minutes.
Suspension cells can be harvested directly by centrifugation.
Collected cells should be washed three times with pre-chilled PBS and resuspended in 150-200 μL of PBS per 1×10^6 cells (it is recommended to add protease inhibitors to the PBS; if the cell count is very low, reduce the PBS volume appropriately).
Disrupt the cells by repeated freezing and thawing or sonication.
Centrifuge the extract at 1500×g for 10 minutes at 2-8°C, and collect the supernatant for analysis.

Other biological fluids: Centrifuge at 1000xg for 20 minutes, remove the supernatant, and test.

Pre-test preparation:
1. Remove the test kit from the refrigerator 10 minutes in advance and equilibrate to room temperature.
2. Prepare the standard gradient working solution: Add 1 mL of universal diluent to the lyophilized standard, let it stand for 15 minutes to completely dissolve, then gently mix (concentration is 20 ng/mL).
Then dilute to the following concentrations: 20 ng/mL, 10 ng/mL, 5 ng/mL, 2.5 ng/mL, 1.25 ng/mL, 0.625 ng/mL, 0.3125 ng/mL, and 0 ng/mL.
Serial dilution method: Take 7 EP tubes and add 500 μL of universal diluent to each tube.
Pipette 500 μL of the 20 ng/mL standard working solution into the first EP tube and mix thoroughly to make a 10 ng/mL standard working solution.
Repeat this procedure for subsequent tubes.
The last tube serves directly as a blank well; there is no need to aspirate the liquid from the penultimate tube.
See the figure below for details.

3. Preparation of Biotinylated Antibody Working Solution: 15 minutes before use, centrifuge the concentrated biotinylated antibody at 1000×g for 1 minute.
Dilute the 100× concentrated biotinylated antibody to a 1× working concentration using universal diluent (e.g., 10µL concentrate + 990µL universal diluent).
Prepare immediately before use.
4. Prepare the enzyme conjugate working solution: 15 minutes before use, centrifuge the 100× concentrated enzyme conjugate at 1000×g for 1 minute.
Dilute the 100× concentrated HRP enzyme conjugate to a 1× working concentration with universal diluent (e.g., 10 μL of concentrate + 990 μL of universal diluent).
Prepare immediately.
5. Prepare the 1× wash solution: Dispense 10 mL of 20× wash solution into 190 mL of distilled water (concentrated wash solution removed from the refrigerator may crystallize; this is normal.
Allow to stand at room temperature until the crystals have completely dissolved before preparing).

Procedure:
1. Remove the desired strips from the aluminum foil bag after equilibration at room temperature for 10 minutes.
Seal the remaining strips in a ziplock bag and return to 4°C.
2. Sample addition: Add 100 μL of sample or standard of varying concentrations to the corresponding wells.
Add 100 μL of universal diluent to the blank wells.
Cover with a film and incubate at 37°C for 60 minutes.
(Recommendation: Dilute the sample to be tested at least 1-fold with universal diluent before adding it to the ELISA plate.
This will reduce the impact of matrix effects on the test results.
The sample concentration should be multiplied by the corresponding dilution factor when calculating the final sample concentration.
It is recommended to run replicates for all test samples and standards.)
3. Add Biotinylated Antibody: Remove the ELISA plate and discard the liquid without washing.
Add 100 μL of Biotinylated Antibody Working Solution directly to each well.
Cover with a film and incubate at 37°C for 60 minutes.
4. Wash: Discard the liquid and add 300 μL of 1x Wash Solution to each well.
Let stand for 1 minute, shake off the wash solution, and pat dry on absorbent paper.
Repeat this process three times (a plate washer can also be used).
5. Add Enzyme Conjugate Working Solution: Add 100 μL of Enzyme Conjugate Working Solution to each well.
Cover with a film and incubate at 37°C for 30 minutes.
6. Washing: Discard the liquid and wash the plate five times as in step 4.
7. Adding substrate: Add 90 μL of substrate (TMB) to each well, cover with a sealing film, and incubate at 37°C in the dark for 15 minutes.
8. Adding stop solution: Remove the ELISA plate and add 50 μL of stop solution directly to each well.
Immediately measure the OD value of each well at a wavelength of 450 nm.

Calculating experimental results:
1. Calculate the average OD value of the standard and sample replicates and subtract the OD value of the blank well as a correction factor.
Plot the standard curve of the four-parameter logistic function on double-logarithmic graph paper, with concentration as the horizontal axis and OD value as the vertical axis.
2. If the sample OD value is higher than the upper limit of the standard curve, dilute the sample appropriately and retest.
Multiply the sample concentration by the corresponding dilution factor.

Theory This kit utilizes a double-antibody sandwich enzyme-linked immunosorbent assay (ELISA). Sample, standard, biotin-labeled detection antibody, and HRP conjugate are sequentially added to microwells pre-coated with a capture antibody against Forkhead Box Protein P3 (FOXP3). After incubation and washing, the sample is developed using the substrate TMB. TMB is converted to blue by HRP peroxidase and to yellow by acid. The intensity of the color is positively correlated with the amount of Forkhead Box Protein P3 (FOXP3) in the sample. The absorbance (OD) is measured at 450 nm using a microplate reader to calculate the sample concentration.
Source Human
Synonym Human Forkhead Box Protein P3  ELISA Kit
Detection Type Double antibody sandwich method
Composition
Name 9 6 T  match   set remark
Pre-coating 96 Well plate 8 Hole ×12 Strip without
Standard 2 branch
Dilute as per instructions
Universal diluent
2×20mL
without
Concentrated biotinylated antibody ( 100× )  
120uL
Dilute as per instructions
Concentrated enzyme conjugate ( 100× )
120uL
Dilute as per instructions
20× Washing liquid
2×10mL
Dilute as per instructions
Bottom thing ( TMB )
10mL
without
Stop liquid
6mL
without
Sealing film
4 Zhang
without
Instructions
1 Share
without
Background FOXP3 (forkhead box P3), also known as scurfin, is a protein involved in immune system responses. As a member of the FOX protein family, FOXP3 appears to play a master role in regulating pathways involved in the development and function of regulatory T cells. In cancer, excessive regulatory T cell activity can prevent the immune system from destroying cancer cells. In autoimmune diseases, insufficient regulatory T cell activity allows other autoimmune cells to attack the body's own tissues. While the precise mechanisms of control remain unknown, FOX proteins belong to the forkhead/winged-helix family of transcriptional regulators and are hypothesized to exert control during transcription through similar DNA-binding interactions.
General Notes 1. Strictly adhere to the specified incubation time and temperature to ensure accurate results. All reagents must be at room temperature (20-25°C) before use. Refrigerate reagents immediately after use.
2. Improper plate washing may result in inaccurate results. Ensure that all liquid in the wells is aspirated thoroughly before adding substrate. Do not allow the wells to dry out during incubation.
3. Remove any residual liquid and fingerprints from the bottom of the plate, as this will affect the OD value.
4. The substrate developer solution should be colorless or very light in color. Do not use substrate solution that has turned blue.
5. Avoid cross-contamination of reagents and specimens to prevent erroneous results.
6. Avoid direct exposure to strong light during storage and incubation.
7. Do not expose any reagents to bleaching solvents or the strong fumes emitted by bleaching solvents. Any bleaching agent will destroy the biological activity of the reagents in the kit.
8. Do not use expired products, and do not mix components with different product numbers and batches.
9. Recombinant proteins from sources other than the kit may not be compatible with the antibodies in this kit and will not be recognized.
10. If there is a possibility of disease transmission, all samples should be managed properly and samples and testing devices should be handled according to prescribed procedures.
Storage Temp. If the unopened kit is stored at 4°C, the shelf life is 6 months.
Test Range 0.31-20 ng/mL
Applications Tissue homogenates, cell lysates, and other biological fluids
Shipping Notes
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 25901008334

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4.6 ★★★★★
Based on 29 reviews
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C
Verified Purchase
Chris C.
Birmingham, US
★★★★★ 5
Prob the best paper for sublimation
Size: 8.5x11inch
Been using this paper for a few years now. Colors always seem to pop and look correct
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 1, 2026
C
Verified Purchase
CFortC
New York, US
★★★★★ 5
Brilliant photo prints on Epson media
For convenience, I am writing and updating this review as I work with the Epson ET-8500. At this point, I have unpacked the device, completed the setup process, installed driver on my Windows 11 PC, printed test pages, and, most recently. installed driver on my Windows 11 laptop. The remainder of the review summarizes all additional experience with the printer. My inkjet printer experience is substantial. After a lifetime of various HP inkjets, the ink/printhead hassle finally led me to the Epson WP-4090 in 2014. That printer served well and reliably but in the past couple years its print quality has become more spotty. It's consumed nearly six complete sets of ink cartridges and I was looking at needing another set sometime this year. Finally, the increasing cost of cartridges vs. decreasing quality has led me to retire the old gal. Unpacking the ET-8500: Removing all the external blue tape was easy. The quick start guide is vague on removing the internal tape. I opened the scanner to reveal the interior where much additional blue tape is located. However, I could not re-close the scanner because I was at this stage unwilling to force it -- everything in there is plastic. I finally located a Reddit string of someone with the same dilemma. The answer is basically to apply more force to the right side. This worked. There was still blue tape visible on the output tray, but not accessible with the output tray retracted. Based on a web query, I manually pulled out the output tray (normally a NO NO based on all other documentation). I removed the tape but of course couldn't close the output tray. The control panel is useless at this point because it is focused ONLY on filling the ink reservoirs. After more web queries, I manually closed the output tray, as gently as possible. Hopefully, I have not destroyed the output tray automation mechanism. I also noticed that the blue transport lock lever was already in the unlocked position. So this printer came all the way from Indonesia to me with the print mechanism unlocked. I will only find out if there is any damage when I start printing in a few days. Rating so far: Three stars based solely on the infernal complication of what should have been an no-brainer unpacking procedure, aggravated by the poor Epson documentation and dicey web insights. I expect this rating would improve in the next several days as I fill the ink reservoirs, connect up the first PC, and perform initial printing. Completing the setup: Filling the ink tanks. Next morning I'm fresh and ready to proceed with the ink. This turns out to be just as easy as promised. Not a drop was spilled. Finally (I thought) was the moment to load letter paper. A web query explained that you must pull out the large bottom paper tray by yanking on the opened bottom cover. I never would have guessed, but it did the trick. I printed the single "alignment" page which looked great but the control panel defaults to printing a bunch more test patterns, which I was able to skip. By the way, after all that struggle to load paper into the bottom tray, the test page demanded a sheet fed from the rear input. Driver installation onto Windows 11 PC: I should mention that I connect this printer via Ethernet, so no fooling around with Wi-Fi settings. The Epson support page allows all driver and utility components to be downloaded individually, but recommends downloading the single, small, master installer. When this one is run, it asks what components you want, then downloads and installs those. It then automatically finds the printer on the network, configures the PC to access it, and offers to print a test page. Wouldn't you know it, the paper source is still that darned single sheet feeder on the rear. Finally, time to use Word to print my standard printer quality page consisting of various fonts and images. First attempt again demanded the single sheet feeder on the rear. I cancelled that job in the queue and looked much more closely at the print options dialog (need the printer-specific dialog, not the Word dialog to see this). Paper source was Auto, which one would imagine means use the main paper tray if it's full and the rear tray is empty. Evidently not. I had to change the paper source setting to specify the lower paper tray. Then it worked fine. Oh, I see from a web query just now that you must "register" the size of paper loaded into each tray into the control panel. Then, it claims, "Auto" source will work correctly. I will have to try that tomorrow. Rating so far: In view of the successful operation of the printer, in spite of all the shenanigans from the day before that could have broken something, I have raised my rating to Four Stars. Driver installation on Windows 11 laptop. I mention this because the installation procedure (identical to that for the Windows 11 PC, above) ran just fine (downloading multi-megabytes of driver installation files over the laptop's Wi-Fi connection) but hard-failed at detecting the printer. It claimed that the laptop wasn't connected to a network. The only option was to cancel the install and start over. My theory is that the author of this code assumed that if the printer were Ethernet-connected, then the computer trying to find it must also be Ethernet-connected. Nonsense, I agree, but I plugged the laptop into an Ethernet port, reran the Epson installer, and it detected the printer just fine, no hesitation. Heady from this success, I installed the Epson Smart Panel app onto my iPad. Needless to say, this app seems to assume everything is on Wi-Fi (and maybe even Bluetooth, which it demands access to - why?). Of course, it couldn't find the Epson printer. However, there was an option to enter the printer's IP address, which worked. It raises the question, what happens if, next time through the DHCP initialization process, the printer is assigned a different IP address? Today, I also "registered" the main lower paper tray as containing letter-sized plain white paper, using the printer's control panel. After that, print jobs with paper source set to "Auto" printed correctly. Woo hoo! In spite of apparent lame networking assumptions coded within the Epson installation package and IOS Smart Panel app, my cumulative star rating remains, for now, at four stars. Remainder of review: the following experiences will be updated from time to time. Connecting printer to Apple Mac Mini Tahoe. The Epson ET-8500 support webpage allows selection of Apple Mac Tahoe but the resulting download is for Intel silicon. However, I found that the Mac's Setup Add Printer function finds the printer on the network and installs required driver software with one click. The is typical Apple user-friendly experience vs. multiple technical steps needed on Windows. Printing of high-quality art prints. I printed out two of mine on 8.5"x11" premium glossy photo paper. Output quality "Standard", while it prints much faster, yields coarse-resolution ink dot patterns on the print. Output quality "High" prints much more slowly, but the image is rendered mostly at resolution. However, under a magnifying lamp, periodic white dots are visible, lined up in the direction of paper travel (not print head travel). These flaws will prevent the prints from being used in presentations. On the web, I learned that these dots are called "Pizza Wheel" marks and are caused by the serrated exit guide wheels pulling the paper through. Some mitigations are suggested, which I will experiment with in the days ahead. Solution to the "Pizza Wheel" marks: Those flawed results described above were obtained using on some old HP Premium Glossy Photo Paper that I had laying around. Understanding that Epson would optimize settings for their own media products, and also that fresh media is usually recommended, I got ahold of some letter-sized Epson Ultra Premium Presentation Paper Matte and some 4"x6" Epson Ultra Premium Photo Paper Glossy (these two styles were the ones available for same-day delivery). The art prints on the presentation paper were flawless, though the brilliance range was of course somewhat reduced from the glossy print. Next, I started printing out some 4"x6"s on the ultra premium glossy stuff and the results were flawless and brilliant. I kept printing a number of my favorite images until I forced myself to stop. Some letter-size of the ultra premium glossy paper is coming soon, and printing on that will be the acid test. But I am happy enough now and confident enough to raise my star rating of this Epson ET-8500 printer to Five Stars. Full-size (8.5"x11") photo printing: Using fresh letter-size Epson Ultra Premium Photo Paper Glossy, I printed two of my art photos with a variety of dark or well-saturated color areas. These came out brilliant and perfect. The Epson ET-8500 is a winner,
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 23, 2026
L
Verified Purchase
L-1011
Fort Morgan, US
★★★★★ 5
Unmatched Quality for Images and Photos
This is an 'initial impressions' review after setup and a few weeks use. - Best Use Case: If, like us, your printing needs are 80% creative (artwork, photographs, etc.), 20% light document printing and occasional scanning, then this printer will meet your needs. Even though you won't be buying a new cartridge with a thimbleful of ink every 100 pages, I would not recommend this printer for high-volume workplace printing. It's not built for speed and you'll be filling the paper tray too often to be productive. Likewise, unlike a more office-oriented printer, the ET-8500 does not have a feeder for the scanner. - Unboxing / Setup: While it did take about an hour to set up, the process went much easier than I anticipated based on the reviews I read. We have it connected to our home network via Ethernet and I was able to do all necessary configuration via the printer's touch screen. Aligning the print heads is a rather lengthy process, so be prepared to spend some time on this. Our old printer would semi-self align by scanning the alignment samples once they were printed. With the ED-8500, I had to manually select which alignment settings looked best, which slowed the process considerably. - Hardware Quality: Overall, the printer feels well-built and worth the money. That being said, I do agree with other reviewers who state the paper trays feel a little chintzy and possibly easy to damage if you don't handle them with kid gloves. No problems thus far, however, so I'm simply crossing my fingers with the hoping for the best. On the flip side, I love that the output tray fully retracts into the printer when not in use. Touch screen operation is a veritable godsend compared to the wonky, practically useless LCD on our old printer. In fact, with a thumb drive or (full sized) SD card, you can perform many operations straight from the touchscreen. - Software: While it did install applications I'm not likely to use, Epson's software is much less intrusive, in my opinion, than you-know-who's naggy, resource consuming bloatware. I can't speak to the smartphone application as I have no need for it thus far. I'm also pleased to report that the printer will work without Alexia, which I will never have a need for. No problems with the software and we're able to print from any computer on the network without issue. - Scanning: As I stated above, there's no feed for the scanner, so you'll have to manually change pages if you have a multi-page document to scan. Not a problem for us, though, and my wife loves that she can scan a document straight to her thumb drive without having to bother me while I'm working. Overall quality is more than adequate for all but the most demanding scanning jobs. - Ink: With its foolproof design, filling the six ink tanks couldn't be easier, and after six weeks of use, including approximately 200 pages of image laden documents using the highest quality print level (which would have eaten up two 'XL' cartridges in my old printer), the ink levels in the ET-8500 have barely moved. Furthermore, refilling all six tanks cost only a little more than those two 'XL' cartridges would have. Very happy in this regard. - Print Quality: Even on regular paper at regular print quality, the ET-8500 hands-down smokes anything in its price range. Amp up the print quality and print to photographic paper and the results are absolutely jaw-dropping. Seriously, my brother is a professional large-format printer / sign maker, and the print quality from the ET-8500 rivals his $75,000 4' x 8' flatbed. Rich, vibrant colors pop from the page and are sure to impress even the toughest critic. This, in my opinion, more than makes up for the ET-8500 not being the fastest horse in the race. I will update my review should anything go south, but for now I give the ET-8500 a big thumbs up. For the quality you get, it is well worth the price in my opinion.
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Reviewed in the United States on May 12, 2025
M
Verified Purchase
MandieSue76
West Palm Beach, US
★★★★★ 1
Overpriced Garbage
Bought March 2024. Paper jam June 2025, after not even hitting 600 pages printed (we never even refilled the ink tanks!). Since it's out of warranty, Epson wanted us to pay to send it back for service. I thought maybe Best Buy Geek Squad would be cheaper, since they'll service items that weren't purchased through them. I have Best Buy Geek Squad here right now and he found "the worst paper jam he's ever seen" and the paper still won't feed, not from the rear, not from the top, not from the tray, even through he found the jam and cleared it. The jammed paper DID come out with rubber crumbs from the feed wheel. He suspects that the wheel is so worn from us trying to fix it with printing cycles, that the wheel needs to be replaced. The part is $110. Getting Geek Squad out here was $125. For a $700 printer that lasted a year. After working for about an hour, the service guy said it sounded like there was a motor wheel not turning properly on one side as well, which was causing grinding gears, and would be a separate replacement part. He said he hates Epson, that most printers are made to be throw away now (our last Canon photo printer lasted 15 years), and to not spend more than $200-$300 on a Brother printer to replace it, so that's what I'm doing. This was my first experience with Epson and it will definitely be my last.
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Reviewed in the United States on July 19, 2025
A
Verified Purchase
Abraham
Battle Creek, US
★★★★★ 5
Excellent print quality, easy-to-use software, very long lasting ink
This review is for an Epson ET-8500 printer/scanner/copier. ET stands for Eco Tank as the printer uses tanks of ink filled by the user from bottles. The tanks last far longer than the ink cartridges we've all been using and the price per page is far less. The 8500 prints 8.5x11 and 8.5x14 as well as smaller sizes like 8x10, 5x7, 4x6 and printable CDs, DVDs and BDs. The scanner has a maximum resolution of 4800 x 1200 dpi. I bought this printer to replace an Epson RX 580 we bought in late 2006 and for which we must have spent several printer's worth of money on ink. Our primary use has been and remains printing photographs. We feel we require a six-ink printer for this task which limited our printer choices. We have never had any brand other than Epson dating back to the dot matrix printers we used with our homemade PC XT so I will be unable to compare the performance of this printer to other brands. We were sorely tempted to buy the ET-8550 vice the 8500 for the occasional need to print 11x14s and larger as it was only an additional $50 but we simply didn't have the table space for it. The price of this printer has come down significantly from when it was first introduced, so if you're thinking you can't afford it, look again. The unpacking and setup on the 8500 were simpler and more trouble-free than other printers I've used in the recent past. The printer can be connected to your computer via a shared wireless or wired network or a primary tier USB link. You can also print from a thumb drive (USB memory stick), your camera's SD chip, wirelessly from a smart phone or tablet. Epson provides the printer with a unique email address and any images sent to that address (from anywhere on the planet) will automatically be printed by your printer. If you have a voice assistant on your home network, you can control your printer with voice commands. All in all, a very capable and well thought out device. We were nervous about filling our ink tanks the first time. The thought of a bottle of printer ink spilling seemed an absolute nightmare. But, as might have been expected, the process was utterly fool-proof (and you're reading a top notch fool here). The tops of the ink bottles and ink tanks are keyed so you cannot put ink in the wrong tank. Ink does not come out of the bottle till it is inverted on the proper tank and flow stops when the tank becomes full. The first filling will also have to fill all the tubing and what not between the tanks and the print nozzles and so will fill the tanks slightly less full than all further bottles. Loading paper is also painless. The printer has two cassettes: one for 8.5 x 11 and one for 5x7 or smaller. The printer can take thicker paper by two routes in the back: the rear paper feeder at the back on top, and the rear paper feed slot, in the rear. Here is my one unpleasantness concerning this printer but fortunately for you and Epson, the unpleasantness was almost entirely my fault. Either route may be used for thicker paper, such a heavyweight photo paper or thick cardstock. The Rear Paper Feeder at the top rear will still take your paper through almost 90 degrees of bend but not the hard 180 that it experiences coming from the cassettes. Paper loaded into the Rear Paper Feed Slot at the printer's rear, will traverse a completely flat path. Theoretically, you could put a sheet of thin glass through there... but please don't. I have used both with 80 lb (thick) photo paper with no problem whatsoever. The unpleasantness I mentioned was caused when I became confused as to which route was which, deciding that the feeder was the slot and the slot was the feeder. This led me to two lengthy calls to Epson tech support where two different techs spent an inordinate amount of time and effort trying to convince me I had made a mistake without insulting a sacred Epson customer by telling me I had made a mistake. When I finally came to my senses, I wrote a long and heartfelt apology to Epson Tech Support for what I had put them through. Very embarrassing. The printers output on plain paper, card stock and three different grades of photo paper has been absolutely perfect. There will always be some difference between your screen and your printer, particularly with the printer straight out of the box and no attempt having been made to match up the two, but the prints have been more than satisfactory to this point. And I have yet to see any of my ink levels - now visible directly through graduated translucent windows on the printer's front - so much as budge. A good portent. I have looked at refill ink bottles and the cost for a full set is slightly more than a set of cartridges for my RX 580 cost but provides several times the quantity of ink. Interestingly, the colors of inks used has changed. My RX 580 used to use Cyan, Light Cyan, Magenta, Light Magenta, Yellow and Black. The ET 8500 uses Cyan, Magenta, Yellow, Photo Grey, Photo Black and Black. That last one is used for text and is not used for photographs. The Photo Grey and Photo Black are not used on text. I only have my eyes, but in my judgement, the prints from the ET 8500 are superior to those from the old RX 580 in accuracy, detail and color. Text documents are crisp and clear. Image quality on plain paper is more than acceptable though I understand there are other brands that do it slightly better. If I had to do it all over, I would again buy the ET 8500. Ease-of-use, economy and beautiful output make it the ideal choice. And I will never again buy a printer that uses cartridges. Never.
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Reviewed in the United States on March 14, 2024

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