Pottery Materials: Underglaze - Gosu (Cobalt Oxide) Ancient Gosu 100g Please be sure to read the profile as well. Type of Gosu: * This is "Ancient Gosu H-11" from Maruni Toryo. * Unopened and unused. Condition of Gosu: * Purchased new a long time ago, but I'm selling it because I no longer plan to use it. * The cellophane tape that was on it when purchased has deteriorated and turned brown. Please be aware that it may come off during packing or shipping. * It will be shipped in another plastic bag. * Due to the nature of the item, we do not accept claims or returns.