Aaron, you are wrong, sorry to say.
Colour does effect the performance of your wheels.
If you compare a black wheel to a white wheel, the black wheel will conduct more than two times the amount of heat, causing rapid changes in temperature in the urethane. This can lead to many problems such as dehubbing.
Please, do not make the wheels black because that would not be 'THE BEST' wheels on the market. I would rather you make the wheels with another colour that is bright, and reflective, not absorbent.