Take a lemon paintbrush and piece of paper cut the lemon and squeeze out its juice in a cup the brush in the lemon juice and write a message on the paper that the paper dry and you find that the letters of your message become invisible now press the paper with hot iron or warm it by holding the above the flame of the candle as the people gets warm invisible letter change into dark brown colour identify the changes that can be reversed
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6
Answer: I think irreversible
Answered by
3
Answer:
it is a irreversible change
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