Turquoise and copper glazes

There are quite a few variations on the turquoise / copper glaze

Transparent turquoise
High alkali frit 85
China clay 15
Copper oxide 2
This is a bright turquoise blue in oxidation and will give a good metallic copper and a lot of other colours in reduction.

Transparent turquoise on white stoneware paperclay, reduced for about 45 minutes.

Blue green
High alkali frit 85
China clay 15
Tin oxide 5
Red iron oxide 3
Copper carbonate 4
As you add iron to the copper based glazes the colour shifts from blue to blue-green to green turquoise.
You can play around with the ratios of copper to iron to get a colour that pleases you.
It is not essential to use the tin, but if you are firing over a high iron body you will find that the opacifying properties of the tin stops the body colour from getting into the glaze.
These glazes are excellent on porcelain.

blue green glaze on white stoneware, reduced

More glazes