Amaco Potter's Choice glazes achieve the effects of Cone 10 reduction without the need for a reduction gas kiln or firing to high temperatures. These lead-free glazes are made to fire at Cone 5-6 in an oxidation kiln. - Amaco Potter's Choice Glaze - Sapphire Float, PC-24, PintPotters Choice Glaze, SAPHR FLOAT PC-24 PT -