Auxochroms

This word is derived from a Greek word auxanein means to increase/intensify and chroma means color. So, the groups which intensify the color is called auxochrome. It also increases the affinity for textile fibers.
Example:
1.      Hydroxyl group (-OH).
2.      Amino group (-NH2).
3.      Methyl group (-NH-CH3).
4.      Nitrate group (-NO3) etc.

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