The keto-aldehyde resin is a colorless or slightly yellow aldehyde condensation resins, insoluble in water, soluble in most organic solvents, and have a good compatibility with the raw materials in the paint, ink formulation having excellent anti-yellowing occurs performance occurs. Major role in the paste of the grind resin as well as applied to the coating formulation, with good color development properties, and can effectively improve paint adhesion, hardness, gloss, solids content, and coating film fullness. Is a multifunctional coating, ink additives.