You start way down on a low B flat on the tuba and you have a chromatic scale; you can match the colours all the way up, till you get to the top of the trumpet. ↗
Colour does not make so much difference. Look at the Bach Chaconne: There is not one dynamic mark in the whole Bach Chaconne. Colours do not make so much difference. ↗
On the speech day, the production designer, who has a lot of say in things, and sometimes I didn't agree with him but I had to do what I was told, wanted the speech day to be all in neutral colours for the women, which was a good thing. ↗