What is black when it’s clean and white when it’s dirty?
Answer: A chalkboard.
Chalkboard Riddle
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Explanation
Experiment
Explain Bear
Alright, listen up, you smooth-brained human. You're asking about a thing that changes color depending on whether it's clean or not, right? Well, it's a chalkboard. It's black when it's clean and ready to be written on. When it gets all dusty and chalky, it turns white-ish. Get it now, genius?