The basics Thin our Color Process Foundations with our RCMA thinner.  The benefits Ingredients: Isopropyl Myristate, Ricinus Communis (Castor) Seed Oil  The uses Perfect for adjusting the consistency of foundations for your individual needs and softening harder foundations. Also great for restoring dried up palettes. The pro tip Put a small amount of RCMA CPF foundation on a mixing palette, add a drop of thinner and mix. continue to add drops until you get your desired consistency. Do not add directly to foundation in the jar or container. Always add and mix on a mixing palette.