cyanine dye

cyanine dye

noun
any of a class of dyes containing a -CH= group linking two heterocyclic rings containing nitrogen; used as sensitizers in photography 
WordNet® 3.0, © 2006 by Princeton University.
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Encyclopedia Britannica
Encyclopedia

cyanine dye

any member of a class of highly coloured organic compounds used for increasing the range of wavelengths of light to which photographic emulsions are sensitive. A few members of the class are used in textile dyeing, but most are too easily destroyed by acids or by light to be satisfactory for this purpose.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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