anyone know who makes black reflective vinyl that reflects black not white or whitish grey?
Okay, think about what you wrote or asked.
You want something to reflect black when moving lights hit it at nighttime... usually in a dimly lit area, huh ??
If that were possible, then what would your background color be ?? White ?? Well, with no lights except moving light, the white is going to be mighty dark, which will conflict with your black reflective.
You're thinking backwards. If you want something to light up totally black at night, make a reflective white background with opaque black lettering and it will be a
reversed reflective lettering job.