What is black when you buy it, red when you use it, and gray when you throw it away?
Solution
Charcoal (or coal)
Charcoal is black before you use it, red when you are burning it, and gray like ashes when you are done with it.
What is black when you buy it, red when you use it, and gray when you throw it away?
Charcoal (or coal)
Charcoal is black before you use it, red when you are burning it, and gray like ashes when you are done with it.
Coal