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Estimation of chromaticity differences has been facilitat.ed by the preparation of a standard mixture diagram showing by a group of ellipses the scale of perceptibility at the various parts of the diagram. The distances from the boundaries of the ellipses to their respective "centers" all correspond approximately to the same number (100) of "least perceptible differences." The estimation of nearest color t emperature has been facilitated by the preparation of a mixture diagram on which is shown a family of straight lines intersecting the Planckian locus; each straight line corresponds approximately to the locus of points representing stimuli of chromaticity more closely resembling that of the Planckian radiator at the intersection tha,n that of any other Planckian radiator. CONTENTS Page

Estimation of chromaticity differences and nearest color temperature on the standard 1931 ICI colorimetric coordinate system