R E EXPORTS aims to produce a complete line of high-quality Fire-Assay cupels. Our Magnesia Cupels uses high-quality raw materials and a unique formula. Our Magnesia Cupels absorbs more lead oxide than ordinary bone ash cupels .In the process of cupellation, The Magnesia Cupels will not cause splashing of lead, can quickly absorb a large amount of lead oxide, and will not crack or pit.