col·our·ant
noun/ˈkʌlərənt/
/ˈkʌlərənt/
(US English colorant)
- a substance that is used to put colour in something, especially a person’s hair
着色剂；染色剂（尤指染发剂） - natural hair colourants
天然染发剂 - Medicines also contain colourants, often in large amounts.
药物还含有着色剂，而且含量通常很高。
- natural hair colourants