colouring
col-our-ing
noun
The act of applying colour to a picture, or the finished result of this activity.
"The children enjoyed their new colouring books."
noun
A substance, often artificial, added to food or other products to give them colour.
"She checked the ingredients for artificial colouring."
Thesaurus
Synonyms: coloring, food color, food colouring, food coloring, food colour, color, colour
Antonyms: achromaticity, achromatism, colorlessness, colourlessness