Black or white coffee we know, but what makes the lids black or white?

Black or white coffee we know, but what makes the lids black or white?

Disposable plastic is a hot topic. Here Shimadzu has analyzed a product designed to contain heat – Coffee cup lids. Both lids display the symbol of recyclable Poly Styrene but have different colors. The question is what makes one appear white and the other black? Analysis by the non-destructive techniques FTIR and EDX can answer that.
Read the application summary