a digestible substance used to give color to food; "food color made from vegetable dyes"
Colouring is a substance that is used to give colour to food. A few drops of green food coloring were added. see also colour
Someone's colouring is the colour of their hair, skin, and eyes. None of them had their father's dark colouring Choose shades which tone in with your natural colouring
a visual attribute of things that results from the light they emit or transmit or reflect; "a white color is made up of many different wavelengths of light"
col·our·ing in AM, use coloring1. The colouring of something is the colour or colours that it is. Other countries vary the coloring of their bank notes as well as their size. the scenery was losing its bright colouring