But the Blackface Minstrel tradition, and blacking-up of mummers and Morris sides are not the same thing. There is no way in which the latter involves performers imitating or mocking black people. If it has been understood that way on some occasions, that is a clear misunderstanding.

That doesn't mean it may not be a good thing to be sensitive to that kind of misunderstanding, and varying the colours is one way of demonstrating that it is a misunderstanding.

There is of course a tradition of white-painted performers - seaside Pierrots. But that is rather beside the point.