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Isolation and Identification of Paint Pigments by Sublimation

Published online by Cambridge University Press:  14 March 2018

Skip J. Palenik*
Affiliation:
Microtrace, Elgin, IL

Extract

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The particle size of organic pigments used in modern coatings is extremely fine. Since these individual pigment crystals are typically less than 1 μm in size, they are difficult, if not impossible, to characterize and identify by microscopical means. The occurrence of occasional pigment aggregates may help identify a pigment to a microscopist who is familiar with a variety of known pigments under controlled conditions. More often, however, such observations provide a qualitative basis for comparison of questioned and known paints without leading to identification of the specific pigments involved. Microscopic observations of this type are assisted by the use of a high-magnification oil immersion objective and condenser with numerical apertures of 1.25 or greater.

Type
Research Article
Copyright
Copyright © Microscopy Society of America 1996

References

Hummel, D.O. and Scholl, F. Atlas of Polymer and Plastic Analysis, 2nd ed. 3 vols. VCH Publishers,Deerfield Beach, FL, 1978.Google Scholar
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