Epson Stylus Pro 7700 Series Reference Manual page 18

Epson UltraChrome VM Ink Technology
A Next Generation Pigment Ink Technology
Unique High-Density Pigment Chemistry Developed by Seiko Epson
Four-Color Printing System Including Dual-Black Inks for Optimal Black Density
Instant Dry and Water Resistant
Extreme High Dynamic Range Color Gamut
True Archival Printing
Professional Short-term Color Stability for Mission Critical Color Proofing
Improved Microcrystal Encapsulation™ Technology for Reduced Gloss Differential
Improved Black Density up to 2.6 with an L* value of ~3.0
Sets a New Standard for Professional Four Color Ink Technology
Dmax and L* Values based on Epson Premium Semigloss Photo Paper (250)