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# Rainbow Film

A rainbow of colors indicates the thickness of a clear, organic film used to mount microscopic particles. The deep blue and brown on the left of this optical micrograph show that the film is less than a micrometer thick, the right thickness for embedding single particles for microstructural analysis. In an AML ultraclean room, NIST chemists mount and analyze individual particles for forensic, advanced materials, and other researchers.

*CSTL

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March 13, 2007

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