Quantitative X-ray emission analysis of paints is seriously complicated by the extreme variation in the absorption coefficient of the matrix due to the wide variety of compounds which may be used for the pigmentation. Methods for determination of specific elements in complex systems by means of matrix matching, dilution, and thin film-controlled mass have been reported (1-6). However, none of these techniques alone have been found adequate when applied to the analysis of paint. © 1969, American Chemical Society. All rights reserved.