An organic compound containing a C=N double bond (imine) with an azo group (N=N), used in dyes, pigments, and photochromic materials that change color with light.
From 'azo-' (N=N bond) + 'methine' (from 'methyl' + '-ine,' relating to C=N bonds). Synthesized in organic chemistry labs in the early 20th century.
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