Glaze Recipe Sample Tile Test Tile Copper Blue Raku Cone 06 Raku
Copper Blue Raku
Added By: opus27no2
1/1/2010 11:41:43 AM
Raku
Reduction
A nice translucent Egyptian blue in moderate reduction, flows well.
Cone: 06
This glaze is lead free.
This glaze is barium free.

Dry Amount:

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Copper Blue Raku is a Raku Ceramic Glaze Recipe.

What is a Raku Glaze?
A raku glaze is a glaze that is fired in the raku process (but sometimes potters fire raku glazes in traditional kilns and sometimes potters fire traditional glazes in raku kilns). The normal raku glaze has a melting point between cone 07 and cone 06 (about 1800 degrees Fahrenheit).

The raku firing process usually takes place outdoors in a special raku kiln. The piece is fired up to temperature in the raku kiln. The raku pottery piece is then removed from the kiln while the glaze is flowing (red hot) with raku tongs. The raku pottery piece is then immediately placed inside a metal can full of combustible materials (usually paper, leaves or sawdust). The metal can is sealed with a lid. The pot is nearly 1800 degrees Fahrenheit, so the heat emitted from the raku pottery piece causes the combustible materials to catch on fire. Because the can is sealed, oxygen is permitted from feeding the fire. As a result, a reduction atmosphere is created and oxygen is drawn out of the raku piece. This reduction in oxygen gives some raku glazes a metallic luster and other raku glazes dark crackled lines.

After the raku pottery piece has been reduced for 10 to 15 minutes, it is removed and submerged in a can of water. This stops the reduction and freezes the patterns in the raku glazes.

Because the raku process can crack the glaze and clay body and because the firing temperatures are so low, raku glazes are not food safe.

Copper Blue Raku is a cone 06 glaze. What is cone 06?

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