Abstract
The visual grading of gloss on cylindrical models of equal specular reflectances differing systematically in color is studied in relation to the effect of color. The results show that visual gloss increases with darkness and saturation, that is, with the deepness of color. In order to express the effect, the following empirical formula is introduced: δ=2-log Y+10Δwhere Y is the luminous reflectance in percentage, Δ the chromaicity difference from neutral on the MacAdam's UCS diagram. The linear correlation of δ with visual grading is found 0.98 or more in correlation coefficient for the specimens used. The verification of the visual gloss being independent of hue is given in Part 2.
