pigment
noun
[ ˈpɪɡm(ə)nt ]
• the natural colouring matter of animal or plant tissue.
• "carotenoid pigments are red, orange, or yellow"
pigment
verb
• colour (something) with or as if with pigment.
• "the therapy masks the appearance of stretch marks by pigmenting skin"
Origin:
Middle English, from Latin pigmentum, from pingere ‘to paint’. The verb dates from the late 19th century.