colourant
noun [ C or U ] UK (US colorant) uk/ˈkʌl.ər.ənt/ us/ˈkʌl.ər.ənt/
色素
a substance that is used to add colour or change the colour of something
colourants that are commonly added to food 经常添加到食品中的色素
hair colourant 染发剂
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