As nouns the difference between colouring and dyestuff
is that colouring is an alternative spelling of lang=en while dyestuff is any soluble pigment used for dyeing the hair, fabric etc.
As a verb colouring
is present participle of lang=en.
colouring
English
Verb
(head)
(British, Canada)
dyestuff
English
Noun
(
en noun)
any soluble pigment used for dyeing the hair, fabric etc