coloring
col.or.ing or col.our.ing n chiefly Brit 1a: the act of applying colors 1b: something that produces color 1c1: the effect produced by applying or combining colors 1c2: natural color 1c3: COMPLEXION, COLORATION 1d: change of appearance (as by adding color) 2: INFLUENCE, BIAS 3: COLOR 4: TIMBRE, QUALITY