So we have these water coolers here at work and when I poured a cup today, I noticed oil-like swirls on the surface. It is not as colorful as when you see it in puddles on the street but it made me wonder what it could be. Ideas?
if its a throw away cup, it could be a waxy residue from it. It could be soap residue if its a plastic/glass resuseable cup.
That also happens to me because of my chapstick/lipgloss too.
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