Place the desired amount of powder into a clean glass, ceramic, or plastic bowl — avoid metal, as it can react with the clay's mineral content. Add lukewarm water gradually while stirring with a non-metal spoon or brush until you reach a smooth, spreadable consistency similar to yogurt. A typical starting ratio is roughly one part clay to one part water by volume, but adjust to your preference.
Apply a thin, even layer to cleansed skin using fingers or a brush, avoiding the eye area and lips. For a first use on reactive skin, test on a small patch (jawline or inner forearm) for 5–10 minutes. Leave the mask on for 10–15 minutes, or until it begins to lighten at the edges but is still slightly damp. Do not let it dry completely to a hard, tight film — this can over-dry and irritate, especially on sensitive or thin skin.
Rinse thoroughly with lukewarm water, using gentle circular motions to benefit from the mild mechanical exfoliation of the fine particles. Pat skin dry and follow with a hydrating toner, serum, or moisturizer while the skin is still damp to lock in moisture. For body use, scale up the quantities proportionally; a 100 g pack yields several full-body applications.