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.

Can you calculate the dimensions of this box with the given data?

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I welcome the day with a show of light, I stealthily came here in the night. I bathe the earthy stuff at dawn, But by noon, alas! I'm gone.

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There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
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Given below is simple addition with a defined pattern pattern:
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8 + 5 = 1
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Can you analyze the pattern and find out the answer for:

4 + 9 = ?

Solve the Addition

Asked by Neha on 05 Apr 2021

A farmer and his neighbour once went to Emperor Akbar"s court with a complaint. "Your Majesty, I bought a well from him," said the farmer pointing to his neighbour, "and now he wants me to pay for the water."
"That"s right, your Majesty," said the neighbour. "I sold him the well but not the water!"?
The Emperor asked Birbal to settle the dispute. How did Birbal solve the dispute?

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What happened when the wheel was invented?

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The Puzzle: Here is a famous prize problem that Sam Loyd issued in 1882, offering $1000 as a prize for the best answer showing how to arrange the seven figures and the eight 'dots' .4.5.6.7.8.9.0. which would add up to 82

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I cannot talk, but I always reply when spoken to. What am I?

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A beggar on the street can make one cigarette out of every 6 cigarette butts he finds. After one whole day of searching and checking public ashtrays the beggar finds a total of 72 cigarette butts. How many cigarettes can he make and smoke from the butts he found?

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I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

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Crossword puzzles

In the 1920s, people feared that crossword puzzles would contribute to illiteracy.