Patent Document ID: 20040252883
Application ID: 10459202
Patent Status: 0

Claim One:
1. A colour recipe calculation method for matt solid colour standards, comprising the following steps: A) acquiring the reflection spectrum of a matt, solid colour standard using one of the following measurement geometries: Aa) 45°/&egr;°-geometry with &egr;&gE;45°, Ab) d/8°-geometry with the specular component included and calculated correction of the specular component and optionally determining the calorimetric positions (L*, a*, b*) derived from the reflection spectrum, B1) matching the experimentally determined reflection spectrum, which has optionally been corrected for the specular component, using optical material parameters, stored in a pigment database, of the pigments of the available colorant system for the preparation of glossy colour shades, so obtaining a colour recipe specifying the nature of the colour-imparting pigments and the concentration thereof, or B2) comparing the experimentally determined reflection spectrum or the calorimetric positions derived therefrom with the colour recipes stored in a colour recipe database for glossy colour shades with their associated reflection spectra or calorimetric positions derived therefrom and identifying from the colour recipe database a colour recipe specifying the nature of the colour-imparting pigments and the concentration thereof which comes closest to the colour standard, C) optionally correcting the colour recipe obtained in B1) or B2) and adjusting the actual colour shade produced with the colour recipe obtained to the desired shade of the colour standard, D) measuring the degree of gloss of the matt, solid colour standard with a reflectometer conventional for gloss measurement at one or more gloss angles, E) determining the quantity of matting agent corresponding to the measured degree of gloss in the matt colour standard with the assistance of previously prepared calibration curves stored in a database for the available colorant system, which curves represent the degree of gloss measured at one or more gloss angles as a function of the quantity of matting agent in a colour recipe and F) obtaining a colour recipe to match the matt colour standard, which recipe contains the quantity of matting agent in addition to the colour recipe obtained in B1) or B2).