Colouring is a related term of pigmentation.
As nouns the difference between colouring and pigmentation
is that colouring is (british|canada) while pigmentation is coloration of human, plant or animal tissue, especially by pigment.
As a verb colouring
is .
colouring
English
Verb
(head)
(British, Canada)
pigmentation
English
Noun
(
en noun)
Coloration of human, plant or animal tissue, especially by pigment.