White when dirty

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




Similar Riddles

There is a box. The area of its top is 240 square units, the area of the front is 300 square units and the area of the end is 180 square units.

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solve this tricky problem?

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I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

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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.