The Relation of the Reflectance of Dyed Fabrics to Dye Concentration and the Instrumental Approach to Colour Matching

The factors governing the reflectance of light by a dyed fabric are discussed, and several theories relating this factor to dye concentration are noted. They may all be reduced approximately to simple reciprocal functions of reflectance. Special reference is made to a theoretical treatment, similar to that given by Kubelka and Munk, for conditions of normal illumination (such as prevail in a spectrophotometer), and the use of this theory in the prediction of matching recipes is illustrated with reference to a simple laboratory instrument.