Pour two ounces of lemon juice into a bowl or glass.
Dip the paint brush into the lemon juice and write a message on the white paper. Allow the paper to dry thoroughly.
Remove the shade from an electric table lamp and turn it on. Allow two minutes for the light bulb to become hot.
Hold the paper two inches over the light bulb, moving the paper from side to side to warm the area that contains the writing, until the written message appears.