At the Domaine d’Esthine, once the donkey’s milk has been collected, the next step is to heat the mixture of milk, vegetable oils, and essential oils. When the mixture reaches 104°F (40°C), caustic soda is added and the mixture is mixed. Then the cold saponification in moulds begins (photo), followed by the cutting of the soaps and a 6-week period in which it is dried in the dark. Rich in vitamins and micronutrients, donkey’s milk is a natural skin tightenor. Its softening and restructuring properties act effectively on weakened skins.