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Noun: food colouring
Usage: Brit, Cdn (US: food coloring)
  1. A digestible substance used to give colour to food
    "food colouring made from vegetable dyes";
    - coloring [US], colouring [Brit, Cdn], food coloring [US], food color [US], food colour [Brit, Cdn]

Type of: food product, foodstuff

Encyclopedia: Food colouring