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The prerequisites for applicability of the Kubelka-Munk theor)) o f diffuse reflectance for obtaining characteristic color curves qf powders are discussed, and some experimental support .for the theory is given. Methods are described for eliminating surface reflection, which is alwa.vs superimposed upon the diJuse reflection and which therefbre distorts the spectrum. The effkct of interactions with the adsorbent on the rejlcction spectra of adsorbed molecules is demonstrated by means of examples, and the speciul suitability qf the method ,for investigating chemisorption and for follo wing reactions at phase boundaries is pointed out. By analogy to the Beer-Lambert law, the Kubelka-Mid ,function can be used for quantitative photometric analysis. The reflectance curves of while standards are presented, and measurements relating to the conditions fbr "injinite1.v thich layers" are reported. The scattering coefficient of the Kubelka-Munk function has been es1imated.for several samples of color-filters as a fiinction q f grain-size and wavelength. The c

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