Amaco Potters 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 Potters Choice Glaze - Pint, Blue MidnightPotters Choice Glaze, BLU MIDNT PC12 PT -