Question

why the colour of the letter change into dark brown which is made from tooth dipped in lemon juice when it is heated​

Answer 1

Answer:

YOUR ANSWER IS HERE..❤.

When you wrote your message using the lemon juice, carbon-based compounds in the juice were absorbed into the paper's fibers. When the carbon came into contact with air, it burned or oxidized. One effect of oxidation is things turn a darker color. (Some oxidation doesn't need heat to occur; it just needs a little air.

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