Epson Stylus Pro 4000 Product Reference Manual page 10

Epson UltraChrome Matte Black Ink Technology is superior to
standard dye based inks for plain or matte type paper printing
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17"
Epson Photo Black Ink can be used for ALL media types, but some plain paper or fine art media will benefit greatly by using the Matte Black Ink Technology
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Benefits
Higher Optical Density
Sharper Text & Line Art
Less Bleeding
Superior Printing on
recycled media types
Epson UltraChrome Ink Technology
Standard Dye
Black Inks
Optical Density = 1.3
(plain recycled Paper)
Epson Matte
Black Inks
Optical Density = 1.69
(plain recycled Paper)
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