Calcium hydroxide lime wash powder made from hydrated lime. -High Calcium Hydrated Lime is caustic, and you want to make sure to wear a mask, gloves and safety glasses (or glasses will work fine). -20 parts water to one part lime powder is the ratio you want to use. -Pre-damping the surface with a primer will make the surface more chemically compatible to receive the lime powder mixture. -You will want to re-stir your mixture each time you apply. You can tint the lime powder with natural pigments in it's dry state before mixing with water. -Stir well and make sure it is all blended. You can use lime wash on brick, mortar, cement etc. and not seal it. It will wear well for many years. -You can mix the Amy Howard at Home binder to your lime wash and pigment to apply to the proper surface. -You can also apply lime wash mixtures into wet venetian plaster to color and add beautiful detail.