Reflectory Method for Measuring Tinting Strength of Pigments (III)
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概要
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The purpose of this experiment is to determine whether the reflectory method for measuring the tinting strength is good or not.<BR>Paint films were prepared from the mixture of seven kinds of red pigments and ZnO, using an acrylic vehicle.<BR>The proportions by weight of red pigments to white pigment were systematically varied by 3.162, 1.468, 0.681. 0.316%, and four films to every proportions were prepared in the random order.<BR>The spectral reflectances of these one hundred and twelve films having complete hiding power were measured and transformed to five kinds of parameters, i. e.<BR>(1) Munsell value (<I>V<SUB>Y</SUB></I>) <BR>(2) Color difference between the original and the tint (Δ<I>E</I>) <BR>(3) Color difference between ZnO and the tint (Δ<I>E</I>') <BR>(4) Kubelka-Munk function of the lowest reflectance (<I>K/S</I>) <BR>(5) Depth of shade by Rabe (θ) <BR>If it is statistically acceptable that the plots of these parameters vs. logarithm of a mixed proportion give families of parallel straight lines, the tinting strength relative to standard may be expressed as the ratio of such parameter when each is mixed in the same proportion with the white pigment.<BR>Following results on the regression analysis between four levels of mixed proportion were shown.<BR>(1) As regards to linearity, in case of <I>K/S</I>, the most adequate results were obtaind, and in cases of <I>V<SUB>Y</SUB></I>, Δ<I>E</I> and Δ<I>E</I>' ranked next, in case of θ, inadequate results were obtained.<BR>(2) As regards to parallelism, in every case, so good results could not be obtained, particularly in cases of Δ<I>E</I>, θ, inadequate results were obtained.<BR>In summary, <I>K/S</I>, <I>V<SUB>Y</SUB></I> and Δ<I>E</I>' barely satisfy the condition mentioned previously. However, if the same experiment on the similar kinds of pigments are tried, the more sufficient result may be expected as reported previously.
- Japan Society of Colour Materialの論文