J & P Coats Limited

Robert Dornan

Anthony Edward Durnian

Roderick McDonald

There is disclosed a method for preparing a color chart comprising the steps of defining a reference color, specifying a range of colors from said reference color, each color being spaced by integral multiples of a preselected color difference value from any other color, the range spanning the color space between the reference color and some other color.

Colour specification

A method for making a dye mixture to produce a target colour on a given substrate, comprising the steps of: &#x2212;a) measuring reflectance values R(&#x3bb;) of the target colour at a plurality of wavelengths &#x3bb;=1, 2 . . . n; b) measuring reflectance values R(&#x3bb;) of the substrate at the same wavelengths &#x3bb;; forming a set of concentrations cof 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 g, k, such that the calculated values for f(R), c, gkapproximate closely the measured values.

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Strathclyde, United Kingdom

Robert Dornan