Abstract

The idea of using the ultraviolet microscope in order to study the component parts of two pigment systems was suggested by Green some years ago. The development of the technique to the necessary degree of refinement has been slow but seems now to have reached a point where valuable information is obtainable. This article shows photomicrographs of lithopone, titanium-barium, titanium-calcium pigments in which the ZnS or TiO2 is pictured as opaque particles and the barium or calcium sulfate as transparent particles. This permits the investigator to study the relative size of each component as well as the amount of coalescence.

© 1934 Optical Society of America

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