Bend a pipe cleaner into a heart shape and tie it to a fishing line on a wooden stick. Then, dissolve some alum in boiling water and add food coloring. Immerse the “heart” in the prepared solution and leave for 6 hours. After a while, rinse the resulting heart in water, blot with a paper towel, and coat with colorless nail polish. Your gift is ready!
As the solution cools, the water partially evaporates and the alum begins to crystallize on the surface of the pipe cleaner, forming neat, beautiful geometric crystals.