Epson UltraChrome Pro T47A7 - 50 ml - gray - original - ink tank - for SureColor SC-P900, SC-P900 Mirage Bundling. UltraChrome PRO ink is based on Epson's famous K3 and HDR ink. It has an aqueous (water-based) all-pigment construction that has been designed for professional and commercial print production. The formulation provides an extended gamut with superior color accuracy and archival level image stability.