Overlay pasta 15gr. Art Clay Overlay Paste has been formulated specifically to use on glazed surfaces such as glazed porcelain, glass and china. Art Clay Silver 650/Overlay Silver Paste (OSP) is „low-fire“ silver clay in paste form, formulated specifically to use on glazed porcelain. Overlay Silver Paste is in a viscous, liquid form and water soluble, so that you can express 3 dimensional drawings on a surface of porcelain, ceramic or glass. After firing at appropriate temperature ranging from 650ºC to 800ºC, it will turn into 99% silver form. During firing, the pure silver powder solidifies. The binding agent consists of carbon, hydrogen and oxygen resulting in the release of harmless carbon dioxide and steam during firing. Some silver settling may occur at bottom of the jar. Stir the paste well with a bamboo skewer or metal spatula before use. This product is water-based and can dry up. Always keep the container tightly capped. (If it dries up, add an appropriate amount of water to recover its original state). To dilute the paste, take out an amount of paste and place it in a separate container. Then, add necessary amount of water. Do not dilute Art Clay Overlay Paste directly inside the bottle.