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J. Soc. Uosmetic Chemists, 17,329-341(1966) The Use of Instrumentation in Cosmetic Color Control HUGH R. DAVIDSON, B.S.* Presented September 15, 1965, Seminar, Los Angeles Synopsis--For many years color measurements have been used in laboratories for the evalua- tion of color differences. Up until the last few years, however, they were usually employed only for qualitative evaluation in production. During recent years new measuring instru- ments, techniques, and computers have been developed in order to permit routine use in color production problems. These new techniques are described. Some of the basic theory is reviewed, but the emphasis is on the practical application. The use of a colorant mixture computer is described in detail. INTRODUCTION Within the plastics, textiles, and paints fields the use of instru- mentation for color control has become much greater during the past few years. Over 150 installations in these fields have proved to be suc- cessful in reducing costs, improving quality, and increasing production. The interest in instrumentation is now spreading into the cosmetic industry. The problems which will be encountered here are similar to those in other fields, and there is every reason to suppose that instru- mentation for cosmetic color control will prove as beneficial as it has in other industries. Among the first of these instrumental systems, and by now the most widely used, is that employing the Davidson and Hemmendinger Color- ant Mixture Computer (COMIC). It is the purpose of this paper to describe briefly the theory behind this system and to discuss some appli- cations in cosmetics. * Davidson and Hemmendinger, Inc., Easton, Pa. 329