I guess this was already discussed somewhere, but I have a suspicion that playing with blue - black combo, which you sometimes do, could be a good idea for "dark side" play.
Because the difference between black and blue seems for me a bit less pronounced/obvious than the difference between red and black or black and acid green (like Dtecs). And that could be advantageous for twiddling, as it might take just a bit longer for the opponent to process, with which rubber you are hitting the ball.
Quick googling seems to also indicate that human eyes are more sensitive to red than to blue light. Chatgpt (I know, not super trustworthy) suggests that "humans may perceive red light faster than blue light".
This way, having "acid green" long pips/antispin would probably be the worst option, adding the potential trigger for "toxicity" which Igor mentioned.
But it's very possible that it's a bit of a stretch and my hypothesis is incorrect. Although, this could be an interesting topic to research as something like a PhD thesis
