Question

Tekken lemon and a paint brush and piece of paper cut the lemon and squeeze it out is used in a cup of the brush in the lemon juice and write a message on the people that the paper dry and you fine find that the letters of your message become invisible now press epaper with hot iron ore warm by holding it above the flame of candle take care that it does not catch fire as the paper gets warm invisible letters change into dark brown colour identify the changes that can be reserved in the in this process

Answer 1

Answer:

I don't think any of it is reversible.....but if you are looking for physical changes then all the changes are physical except writing on the paper and changing the invisible letters to dark brown