Armed with their dye pipettes, the chemistry apprentices will be able to color the liquid soap that they have poured into molds in the shape of a stone fragment. They will also be able to add some flakes to make their soaps shine. Moments later, they will be able to reveal their creations, reminiscent of gemstones like turquoise, emeralds, or rubies, before enjoying the pleasure of washing with them. A scientific notebook explains the origin of the soaps and the key principles of soap making.