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Use "colouring" in a sentence
"Do you think that extra water would have to be added to account for the liquid missing if the food colouring is omitted?"
"The unusual colouring is normally seen on growing cubs before the fox develops its dark chestnut coat, however some red foxes remain black due to a rare genetic flaw, which dates back hundreds of years."
"Except that I am convinced that you would find subtle differences in colouring if you compared that picture of "Humphrey" with earlier ones of him."