colourant

Word family  noun colour/color colouring/coloring coloration colourant/colorant colourist/colorist adjective coloured/colored discoloured/discolored colourful/colorful ≠ colourless/colorless multicoloured colour/color verb colour/color adverb colourfully/colorfully ≠ colourlessly/colorlessly

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++col·our·ant British English, colorant American English /ˈkʌlərənt/ noun [countable]  a substance used to change the colour of something, especially someone’s hair 着色剂，染色剂；〔尤指〕染发剂 SYN dye

Examples from the Corpus

colourant• Although it is sold under that name it will have been replaced with a pigment or dye colourant.• Delicate waves and subtle highlights enhance gentle movement Natural colourant adds richness to long, wavy hair.

col·our·ant nounChineseSyllable  

something, substance colour to change used of the a especially Corpus

colourant
col‧our‧ant British English, colorant American English /ˈkʌlərənt/ noun [countable]a substance used to change the colour of something, especially someone’s hair
   SYN  dye

col·our·ant (especially US col·or·ant) BrE /ˈkʌlərənt/ 🔊NAmE /ˈkʌlərənt/ 🔊 nouna substance that is used to put colour in sth, especially a person's hair 着色剂；染色剂（尤指染发剂）