Abstract

The reflectances of a number of different barium sulfate substances were measured. The measurements show a correlation between the reflectance and chemical impurities as well as their grain sizes. In view of the problem of developing better working white standards, the importance of these results is discussed with respect to the magnesium oxide white standard, as well as the perfect diffuser which the CIE recently recommended for ultimate adoption as the reference standard.

© 1960 Optical Society of America

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