Plural of cyanin; multiple blue organic dyes or pigments, particularly synthetic cyanine-type dyes.
From cyanin + -s (plural marker). This form represents the plural of the older cyanin term.
The variation between 'cyanin,' 'cyanine,' and 'cyanins' shows that chemistry nomenclature was somewhat loose in the 1800s-1900s before modern standards—different researchers in different countries used slightly different forms.
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