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

从李子皮中提取天然是一种安全无毒食。

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情况下，着剂是恢复头发颜主要方法。

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

介绍了学记录介质有机染料,如多甲川菁、酞菁、荼醌以及变化合物等。