StupidQuestionFilter? Why doesn't detergent stain my whites?
July 28, 2007 1:00 PM Subscribe
I just poured a cupful of dark blue liquid detergent and purple liquid stain remover over a load of white towels. Setting aside the admonition that I should have poured the detergent in BEFORE the clothes: why doesn't dark blue detergent turn white towels blue? I mean it obviously doesn't. But it seems counterintuitive. What kind of coloring is added to detergent that allows it to be blue and pretty but wash right away?