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What is black when you buy it, red when you use it, and gray when you throw it away?
Common Wrong Answers
“Coal”
Coal is black when you buy it, but it does not turn red when used. Instead, it burns and produces smoke, remaining black.
“Firewood”
Firewood is typically brown or tan when bought, may turn black when burned (not red), and ash (gray) when thrown away.
“Bricks”
Bricks can be red or brown when bought, and they do not change color when used or thrown away.