Colors (the Brits spell it colours) are funny. I even doubt they are accurate. I often say green, only to be corrected: "It's not green, it's blue." I may be color-blind, daltonic.
In Spanish we say: ¿De qué color es el pelo de Margarita? And in English we'll ask: "What color is Margaret's hair?"
What color tie should I wear? ¿Qué color de corbata debo (debería) llevar?
Local color, color local.
That is a horse of a different color, eso es harina de otro costal.
To color, colorear.