[Jedi Master Pikachu]

Yep, they'd appear black; they'd absorb the light behind them.

[beezdotcom]

Yep, they'd appear black; they'd absorb the light behind them.

Well, not necessarily. The stuff could just be completely transparent - not reflecting ANY light, but not absorbing it, either. Your body would still reflect the light that passed easily through the substance. Therefore, clothing made out of this stuff would look like - NAKEDNESS!