How is it considered a 6 ink system, when 2 bottles are the same black?

According to one review: "The sixth ink is a pigment-based black which is better for text documents because it is more robust than dye." Each of the black inks have a specific purpose in printing: one for text, and one for image. The printer has a greater tonal range due to the grey ink as well. Also, use proper paper. I have compared the same image on different papers: the Epson paper (glossy, semi-glossy) provide a deep black. I also use HP paper, but the Epson paper gives me a deep black, while the HP can often provide a deep black with a very slight purple tinge; you have to look real hard, but it is there. When I was working with SIGGRAPH, a computer graphics society, we published our journal, which used a double black. A black on a black. Printing color has a lot of history, and I suggest developing your own work process, which will eventually provide better images for you in future use. I use an ET-3750 color Epson printer: I use that for printing color brochures, and anything which does not require critical specifications for color printing (although it prints beautiful glossy images as well). I use the ET-8550 for wide format images. There are YouTube videos regarding this printer, and some discussions regarding color print testing.

Trying to print photo christmas cards (matte finish). What are some good paper optio s?

Red River Paper makes a wide variety of awesome greeting card papers. I have probably printed 3000 cards with the 8550 so far and they do awesome in this printer. I really love that they have several weight options for matte, and they offer linen and canvas cards as well in multiple sizes.

Does the epson ET-8550 print for heat transfer sublimation?

YES, the ET-8550 can be used "out of the box" for sublimation printing as long as you have sourced the 6-color sublimation ink. Do not use the ink that comes with the printer for sublimation, you'll just contaminate your tank. It is likely that doing this will void the warranty, but you'll have the best-looking and largest sublimation prints!

B&W Pages per Minute	16 ppm
Color Pages per Minute	12 ppm
Hardware Connectivity	USB
Connectivity Technology	Wireless
Additional Printer Functions	Copy, Scan
Warranty Type	Limited Warranty
Control Method	App, Touch
Controller Type	iOS, Android
Print media	Glossy photo paper
Scanner Type	Photo
Display Type	LCD
Compatible Devices	Smartphones, PC
Printer Type	Inkjet
Additional Features	Auto Document Feeder, Wireless, Double Sided Scanning, Auto-Duplex, Borderless Printing, Touch Screen, Display Screen, Auto-Duplex
Printer Output Type	Color, Monochrome
Item Weight	24.5 Pounds
Item Dimensions D x W x H	29.8"D x 20.6"W x 16.9"H
Paper Size	13" x 19" (A3+), 11" x 17", A3, Legal, Letter, A4, Executive, 8" x 10", 5" x 7", 4" x 6", 3.5" x 5", A6, Half Letter, #10 Envelope, User Defined (2.2" x 3.4" to 13" x 78.7")
Maximum Sheet Capacity	100
Media Size Maximum	13 x 19 inch
Wattage	1.5E+2
Is Electric	Yes
Power Consumption	150 Watts
Duplex	auto
Dual-sided printing	Yes
Color	White

EcoTank Photo ET-8550 Wireless Wide-format Color All-in-One Supertank Printer with Scanner, Copier, Ethernet and 4.3-inch Color Touchscreen

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