Hi there! We’ve been getting a lot of email and social media messages on three topics. Under glaze or over glaze? Best firing temperatures? And would we sell ceramic decals? Under glaze or over glaze?Artists who use iron oxide decals are accustomed to adding them either over or under glaze. CerPrint decals are typically used over a fired glaze surface, but we have had some users who have used them under glaze with success. We have not tested CerPrint decals