The invention relates to a generally used color for printing ink. It is characterized in that comprised material and their weight proportion are as follows: pigment 25- 80%, keto-aldehyde resin 5- 32%, ester solvent 10- 40%, dispersing agent A 1- 9% or dispersing agent B 1- 6%, surface processing agent 0- 5%. Said keto-aldehyde resin is characterized by high softening point, outstanding pigment wetting property and soluble property, and good compatiablility with various resins, solvents and adjuvants, and it includes nadone- polyacetal, fat acetal resin, acetyl benzene- acetal resin and etc. The invention is characterized by good color compatability, metering injection way, suitability for factory or shop color mixing, strict control for color phase, color strength and flow index, and high color concentration.