These are some of the first rocks I made, in preparation for the Port Orford Heads Lifeboat Station Diorama. They are a mixture of plaster and charcoal-tinted grout. India ink, diluted in 91% rubbing alcohol, is added in layers, and each is heat-treated with a heat gun. Other airbrush colors and printing ink colors are added, also diluted. The heat gun plays a crucial role in moving the color about the surface prior to settling. The surface is Envirotex Lite epoxy and acrylics.
First Rocks by Roger Rasmussen