Science Riddle

Science Riddle - 14 October

What is black when you buy it, red when you use it, and gray when you throw it away?

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6 comments:

  1. black (in normal form)
    red (when using while burning )
    and grey (as ash after use when throwing away)

    ReplyDelete
  2. AGARBATHI

    black (normal form)
    red (while burning)
    grey (ash)

    ReplyDelete