The relationship between the ratio K/S and reflectance as derived by Kubelka and Munk has frequently been used for analytical work, but little attempt has been made to evaluate the accuracy of its application in calorimetric terms. This evaluation has now been made for dyeings by comparing the predicted color with that actually obtained in textile dyeings, and the difference has been expressed in terms of Munsell notation. In this manner the accuracy of the method has been examined for acid, chromed, and metalized dyestuffs on wool, for “acetate” dyes, and for direct and vat dyes on cotton. We find the accuracy of color prediction for acid dyestuffs on wool to average ±0.5 hue step ±0.1 value step, and ±10.4 chroma step. Predictions for the other applications are nearly as accurate except in those cases where interaction of dyestuff molecules occurs.

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