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 - 25 lb, Smokey MerlotPotters Choice Glaze, SMKY MERLT PC57 25LB -