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Black foam core, and black wrap, control spill by sucking up the light and causing it to cease to exist. White foam core would cause the light to bounce around; black causes the light to simply stop (well, it converts it from light to heat, technically). Foam core is cheap and easy to use, black wrap is superb for the purpose because it can be easily molded into whatever shape you need.how and why are foam and black wrap use to control spill.
Very Einsteinian. Sort of like a black hole.Barry_Green said:Black foam core, and black wrap, control spill by sucking up the light and causing it to cease to exist.