Abstract

Color measurement of anatase and rutile pigmentations using various color-mixture functions has shown that Judd’s 1949 modification of the standard observer provides the closest agreement with visual perception. The effect of Judd’s modification is to change the <i>Z</i>¯ function and the short-wavelength lobe of the <i>X</i>¯ function, so that for a tristimulus filter colorimeter it is necessary to change only the blue filter. Such a blue filter has been designed for use with the Colormaster differential colorimeter. With this new filter, accurate color grading (in agreement with visual perception) can be made for titanium dioxide.

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