as the posters above have said every colour could give offense to some minority or other

I don't know which world you live in, akenaton, but in this one there's a long history of White people blacking-up in imitation of Black people. Browning-up, yellowing-up... not so much. And do tell us who is likely to be offended by dancers with their faces painted blue, or purple, or khaki, or white.