Mayco RK105 Copper Penny Raku Glaze, Pint Opaque Underglazes Cobalt Oxide is the most

Cobalt Oxide is the most powerful ceramic colorant and it appears in glaze recipes at 1% or less

Lengthens the drying time after the glaze is brushed on

It has exceptional strength and plasticity

The tile displayed is the final fired result at cone 5

That gives it a lot of bang-for-buck as a flux

Mayco RK105 Copper Penny Raku Glaze, Pint Opaque Underglazes Cobalt Oxide is the mostCoppy Penny develops a glossy copper finish with various iridescent shades of blue and purple following a proper raku firing. Due to the unpredictable nature of this firing technique, results will vary with every firing. To apply, shake for 5 6 seconds, stir well and apply 2 coats to bisqueware. Allow to dry thoroughly and fire to cone 06 (1850F, 1010C). Reduce in your choice of combustible materials. Thinner coats tend to produce greater metallic