Expression ET-3600
The Expression ET-3600 runs a split ink system — read this before ordering: its black is the 774 bottle (T774120, 140 mL pigment, up to 6,000 pages), while its cyan, magenta and yellow are 664 bottles (70 mL, up to 6,500 pages each). The products below are exactly that combination — no 664 black is listed for this printer, because Epson doesn't spec one for it.
| Bottle | Type | Color | Approx. Yield |
|---|---|---|---|
| Epson T774120 (compatible) | Pigment ink bottle, 140 mL | Black | 6,000 pages |
| Epson T664220 (compatible) | Ink bottle, 70 mL | Cyan | 6,500 pages |
| Epson T664320 (compatible) | Ink bottle, 70 mL | Magenta | 6,500 pages |
| Epson T664420 (compatible) | Ink bottle, 70 mL | Yellow | 6,500 pages |
ET-3600 Ink: 774 Black + 664 Colors — the Split System Epson's ET-3600 specification sheet states the replacement set in one line: "774 Black ink bottle (140 mL) yield: 6,000; 664 color ink bottle (70 mL) yield: 6,500." The printer shipped with 1 × 774 Black and one of each 664 colour, and its Ink Finder listing confirms the same split (T774120-S present; T664120-S absent).
This matters because the internet gets it wrong: some sellers list the 664 black and the all-664 set for this model. Epson's own lists exclude them. Putting the wrong black in is not a harmless substitution — the 774 is a 140 mL pigment bottle; the 664 is a different, smaller bottle for a different group of printers (ET-2500 series, ET-4500).
The correct shelf for this printer is four bottles: 774 black + 664 cyan/magenta/yellow, all below, each covered by our lifetime warranty with 1-year free returns.