Production method of the dye blend in order to make a certain target color

摘要

A method for making a dye mixture to produce a target colour on a given substrate, comprising the steps of: -a) measuring reflectance values RSUBT/SUB(lambdaSUBi/SUB) of the target colour at a plurality of wavelengths lambdaSUBi/SUB=1, 2 . . . n; b) measuring reflectance values RSUBs /SUB(lambdaSUBi/SUB) of the substrate at the same wavelengths lambdaSUBi/SUB; forming a set of concentrations cSUBj /SUBof M dyes in the calculated concentrations; the database having been compiled by aa) making dyeings of combinations of the dyes Dn at different concentrations; bb) measuring the reflectance values R of the dyeings at different wavelengths; cc) defining a function f(R); dd) defining a relationship between f(R) and c involving constants g and k; and ee) for each dye Dn determining constants gSUBn/SUB, kSUBn/SUB, such that the calculated values for f(R), c, gSUBn /SUBkSUBn /SUBapproximate closely the measured values.