Standard Proofing Paper Offering the widest color gamut available for accurate color reproductions, this proofing paper provides a base color, weight, and gloss level designed to match color-critical commercial offset, press applications. Optimized for proofing applications, when used with the Epson the UltraChromeTM K3 Ink, this media delivers outstanding short-term stability. In facts, it's designed to meet the exacting standards established by the GRACoL® Committee.