colorant

If the hair graying is inreversible, hair colorant is the main choice for the masking of hair color change.

在无法逆转头发灰的情况下，着色剂是恢复头发颜色的主要方法。

This article describes the use of organic colorants as the optical recording media, such as polymethine cyanine, phthalocyanine, naphthocquinone and photochromic compounds.

用作学记录质的有机料,如多甲川菁、酞菁、荼醌以色化合物等。