Why this answer matters
EcoTank printers use refill bottles rather than conventional replaceable ink cartridges. Buying by a generic 'Epson ink' label is not enough; the bottle family must match the model and region.
3 requirements3 verification steps1 primary source
Requirements
What has to be true
- Use the T502 bottle family listed for the ET-2850 in the applicable Epson region.
- Match black/cyan/magenta/yellow bottles to the correct tank; do not mix unidentified ink types.
- Verify the model and local Epson part code before purchase if the printer was imported from another region.
Verify it yourself
Use this test sequence
Change one variable at a time so you know which requirement made the difference.
- 1
Confirm the printer model reads ET-2850.
- 2
Check Epson's local supplies page for the exact T502 SKU in your country.
- 3
If print quality is poor despite correct ink, run a DeviceOK color/alignment reference before assuming the ink bottle itself is the cause.
Limits
What this answer does not prove
- Published page yields are test estimates, not guaranteed real-world page counts.
- DeviceOK does not recommend third-party ink chemistry or cross-model substitutions without manufacturer documentation.
Relevant DeviceOK checks
Test the part you can observe
Printer Color Test PagePrint CMYK and RGB reference blocks to inspect missing colors and obvious print-quality problems.
→Printer Grayscale Test PagePrint a stepped grayscale to inspect tonal separation, color casts, and blocked shadows or highlights.
→Printer Alignment Test PagePrint fine lines and alignment references to inspect registration and obvious misalignment.
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