Glaze Recipe Sample Tile Test Tile Copper luster Cone 05 Raku
Copper luster
Added By: DIRECTIONS POTTERY
3/2/2011 7:31:35 PM
Raku
Reduction
Copper penny luster, to green with oxidation. Apply over Harvest Wheat to get rich magenta to gold/silver luster in reduction. you can get the same patina that you get in a dry luster glaze without the fading.
Cone: 05
This glaze is lead free.
This glaze is barium free.

Dry Amount:

'DIRECTIONS POTTERY' has chosen to display this recipe.
Glaze Name:Copper luster
Cone:05
Type:Raku
Description:Copper penny luster, to green with oxidation. Apply over Harvest Wheat to get rich magenta to gold/silver luster in reduction. you can get the same patina that you get in a dry luster glaze without the fading.
Special Instructions:1 lb of glaze to 1.2 lbs of water, let sit for 2-4 hours for the glaze to fully open up. Can be sprayed (please wear proper respirator), dipped, poured, or brushed.
Main Ingredients:
Gillespie Borate:62.50 Grams
Nepheline Syenite:8.90 Grams
G-200 Feldspar (GlazeMixer Blended):8.90 Grams
6 Tile Kaolin:11.00 Grams
Silica 325 Mesh:8.90 Grams
Total:100.20 Grams
Add:
Yellow Ochre:8.00 %
Black Copper Oxide:2.00 %
Cobalt Oxide:1.00 %

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Copper luster 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 luster is a cone 05 glaze. What is cone 05?

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