Patent ID: 6120589
Filing Date: 2000-09-19
Classification: C09D

Abstract:
A set of color ink compositions for ink-jet printing comprising a yellow ink composition, a magenta ink composition and a cyan ink composition, each of which color ink compositions comprises water, a water-soluble coloring agent, a wetting agent, a surfactant and an antiseptic and mildewproofing agent, each of said yellow ink composition, said magenta ink composition and said cyan ink composition having the following lightness index L*, and chromaticness indices a* and b* in L*a*b* color space, which are calculated from a spectral transmittance of each of said ink compositions which are diluted with water 2000 times:said yellow ink composition: L*=95.+-.5, a*=-6.+-.5, b*=23.+-.12,said magenta ink composition: L*=75.+-.5, a*=55.+-.25, b*=-28.+-.10, andsaid cyan ink composition: L*87.+-.5, a*=-35.+-.10, b*=-19.+-.8.