coloring

noun

An act or process which applies color.
Any substance used to give color.
“Our cookies contain no artificial flavorings or colorings.”
“The Department of Health and Human Services and the Food and Drug Administration announced on Tuesday a series of measures to phase out eight artificial food dyes and colorings from America's food supply by the end of next year. […] The proposal also outlined a commitment for companies to supply food for school lunches that does not include artificial dyes or coloring.”
The appearance as to color.
“The Rolands, both U.S.-educated lawyers with faculty positions in the national law school, are olive skinned, with the coloring of some Italians or Sephardic Jews.”
A disguise or discoloration.
An assignment of a color to each vertex of a graph, usually such that no two vertices connected by an edge are given the same color.