werid cup .. what u think?
by, 12-01-2008 at 06:38 PM (497 Views)
I get two white plastic cup from school which I put pencil and paper in them. A few weeks a go I notice that one of them actually turn pink at the bottom of the cup which I thought cause by stain of my lotion. Yesterday night i notice that both cups are pink from bottom to top and they are still pink this morning. But now they are white back to normal color. isn't it werid.
Wonder what cause them to change color?