We invite you to solve an interesting riddle. So, try to guess what the riddle is about:
What is black when it’s clean and white when it’s dirty?
What is it?
If you still haven’t guessed what the riddle is about, you will find a small hint below.
Show Hint
Hint: You used to write on it a lot when you were younger, but it didn’t happen at home. In addition to black it can also be for example green.
Right answer:
Show answer
Answer: Blackboard/Chalkboard.
