colorant

The natural haematochrome extracted from plum skin is a kind of safe and non - poisonous colorant.

从李子皮中提取的天然红色素是一种安全无毒的食用色素。

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

在无法逆转灰的情况下，着色剂是恢复颜色的主要法。

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

介绍了用作光学记录介质的有机染料,如菁、酞菁、荼醌以及光色化合物等。