Don't get me started on my favourite subject / pet hate
As I am red/green colourblind, which also affects shade of brown, I have often had my shoot ruined by bonkers colour schemes
. which some course setters find amusing. As has been rightly said, it is not a test of eyesight, so I like to see good contrast, not, as Ian pointed out, the dreaded black / dark red combo!
I'm still not sure what the best combination is, but maybe yellow flouro with a a black kill is best, when the KZ paint is knocked off, there is still some contrast around it. Not completely sure though.
See my post here: http://www.mfbb.net/lvagc/lvagc-about1556.html