Cobalt three ways... Oil spotting with iron and MgO, variegating with rutile and crystalizing with zinc. #cobalt #cobaltblue #cone6 #ceramics #crystals #pottery #porcelain #oilspot #oilspotglaze #crystallineglaze #blue #trifecta #seattleceramics (at Seattle, Washington) https://www.instagram.com/p/By0RqZRAwzK/?igshid=1j5t2gs1qhrwf












