White when dirty

I am white when I am dirty, and black when I am clean. What am I?




Similar Riddles

Look at this sequence from top to bottom. What is the next number in the sequence?
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Amazing Facts

Gamers

In 2011, people playing Foldit, an online puzzle game about protein folding, resolved the structure of an enzyme that causes an Aids-like disease in monkeys. Researchers had been working on the problem for 13 years. The gamers solved it in three weeks.