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.

在无法逆转头发变灰的情况下，着色剂头发颜色的主要法。

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

介绍了用作光介质的有机染料,如多甲川菁、酞菁、荼醌以及光变色化合物等。