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English definition of “colouring”

colouring

noun [C or U] (SUBSTANCE) UK (US coloring)     /ˈkʌl.ər.ɪŋ/ US  /-ɚ-/
a substance that is added to food or drink to change its colour artificially : It says on the label that no preservatives or artificial colourings have been added .Additives in food and drinks
(Definition of colouring noun (SUBSTANCE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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