Fine concentrated chalk-like color powders used for tinting Hydrocal, Gypsolite, SculptaMold, or any water based plaster product. Concentrated and POWERFUL...a little goes a long way. Simply add color while mixing plaster. Permanent color that will not fade. Ideal for dry weathering techniques. May also be used as a dry weathering chalk on white plaster or polyurethane foam rocks and masonry pieces. Powder tints are also recommended as the fastest and most permanent means of coloring your SUPERTREES!