PURPOSE: To obtain dyed articles excellent in built-up property and color phase constancy in various concentrations by dyeing or printing natural or synthetic polyamide fibers with specific red, yellow and blue dyestuffs excellent in compatibility.

CONSTITUTION: Natural or synthetic polyamide fiber materials are dyed or printed with excellent built-up property using trichromatic dyestuffs excellent in compatibility consisting of a red dyestuff shown by formula I (wherein D is a diazo component of benzene or naphthalene base; R1-R4 are each H or a 1-8C alkyl; (n) is 1, 2, 3, 4 or 5), a yellow or orange dyestuff shown by formula II (wherein B1, B2 and E1 are each H, a 1-4C alkyl or 1-4C alkoxy; X is 1-4C alkyl or 1-4C hydroxyl alkyl) or formula III (wherein Z1-Z3 are each H, a halogen, 1-4C alkyl or the like) and a blue dyestuff shown by formula IV (wherein one of Ys is H or methyl and another is a 2-4C alkanoylimino or the like; Z is H or methyl). The dyed articles excellent in color phase constancy in various concentrations are obtained using these trichromatic dyestuffs.