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1·Heterocyclic azo dyes are one group of the most important chromogenic reagents in spectrophotometric analysis.

杂环偶氮试剂是一类重要的有机显色剂。

2·First, the azo dye with N-hydroxyethyl functional group in coupling components is taken as the raw material to have acryloyl reaction, to obtain hair color monomer.

首先用偶合组分上带n -羟乙基官能团的偶氮染料为原料经丙烯酰化反应，得到发色单体。