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Photographic gallery.  Thousands of particles under the microscope.

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.


Match at 589 nanometers wavelength

Darkfield Dispersion Staining

Match at 540 nanometers wavelength, Chrysotile Asbestos Parallel to length

Darkfield Dispersion Staining

Match at 620 nanometers wavelength, Chrysotile Asbestos Perpendicular to length

Darkfield Dispersion Staining

Match at 440 nanometers wavelength, Amosite Asbestos Parallel to Length, Anthophyllite Asbestos Parallel to Length, Tremolite Asbestos Parallel to Length

Darkfield Dispersion Staining Anthophyllite Tremolite

Match at 650 nanometers wavelength, Amosite Asbestos Perpendicular to Length, Anthyophyllite Asbestos Perpendicular to Length, Tremolite Asbestos Perpendicular to Length (660)

Darkfield Dispersion Staining Anthophyllite Tremolite

Match at 670 nanometers wavelength; the colors are much more brilliant with the 10X objective.

Darkfield Dispersion Staining Darkfield Dispersion Staining

Match at 530 nanometers wavelength

Darkfield Dispersion Staining

Match at 490 nanometers wavelength; the colors are much more brilliant with the 10X objective.

Darkfield Dispersion Staining Darkfield Dispersion Staining

Match at 460 nanometers wavelength; the colors are much more brilliant with the 10X objective.

Darkfield Dispersion Staining Darkfield Dispersion Staining