Making dye mixtures to produce a certain target color

Details Making dye mixtures to produce a certain target color Making dye mixtures to produce a certain target color

2005-08-23

2005-08-23

Evans, F. L. (Department: 2877)

Optics: measuring and testing

By shade or color

C356S407000

Reexamination Certificate

active

06934026

ABSTRACT:
A method for making a dye mixture to produce a target colour on a given substrate, comprising the steps of: −a) measuring reflectance values RT(λi) of the target colour at a plurality of wavelengths λi=1, 2 . . . n; b) measuring reflectance values Rs(λi) of the substrate at the same wavelengths λi; forming a set of concentrations cjof 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 gn, kn, such that the calculated values for f(R), c, gnknapproximate closely the measured values.

REFERENCES:
patent: 5023814 (1991-06-01), Guillemin
patent: 5402362 (1995-03-01), Prosser
patent: 0 360 738 (1990-03-01), None
patent: 0 446 168 (1991-09-01), None
patent: 0 527 108 (1993-02-01), None
patent: 2 192 455 (1988-01-01), None
patent: 62142242 (1987-06-01), None
patent: WO 89/09383 (1989-10-01), None

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