Note: in AM, use 'coloring'
1.
The ~ 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 ~.
N-UNCOUNT: usu with poss
2.
Someone’s ~ is the colour of their hair, skin, and eyes.
None of them had their father’s dark ~...
Choose shades which tone in with your natural ~.
N-UNCOUNT: usu with poss
3.
Colouring is a substance that is used to give colour to food.
A few drops of green food coloring were added.
N-UNCOUNT
4.
see also colour