Mix the contents of the sachet (25 g of powder) and 100 ml of water in a shaker, shake vigorously for several seconds until the mask becomes homogeneous. Apply a thick layer of the mask immediately to the face and neck with a spatula. Leave on for 10 minutes. Gently remove the mask, starting from the neck, remove the residue with a sponge soaked in HP tonic. Finish off with a cream.