Photographic Gallery

Back to Photogallery - - Click on images for a larger view and more information - - Dispersion Staining, Darkfield In the 1940's an Industrial Hygienst by the name of G. C. Crossmon developed the use of darkfield dispersion staining for the analysis of quartz in dust samples. This technique was further refined by R. G Speight in the 1970's by using a more restricked cone of light from the condenser.