Jo Sonja's Opal Dust is a clear gel that contains tiny light-reflecting holographic particles which create an interplay of colors reminiscent of Australia's rare gems. Opal Dust may be used alone or applied to a dry pre-painted surface. It is suitable for a variety of surfaces including paper, card, glass, transparency film, plastic, canvas, wood, terra cotta, tin, fabric, silk or dried flowers. Mix with Jo Sonja's Artists' Colors before application for a more subtle effect. Apply over Jo Sonja's Texture Paste to create the appearance of snow. Drying time depends upon thickness of application. Brushstrokes are evident when wet but disappear when fully dry. Cleans up with mild soap and water.