noun (n)

• a digestible substance used to give color to food(noun.food)

  Synonym:
  coloring, food color, food coloring, food colour, food colouring
  

  source: wordnet30
• a visual attribute of things that results from the light they emit or transmit or reflect(noun.attribute)

  Synonym:
  color, coloring, colour
  Antonym:
  achromaticity, achromatism, colorlessness, colourlessness
  

  source: wordnet30
• the act or process of changing the color of something(noun.act)

  Synonym:
  coloring
  

  source: wordnet30