Copper Green

Stoneware vase with copper green glaze and flow glaze by Amy Myers
Stoneware vase with copper green glaze and flow glaze

Copper Green Glaze

This is basically a high-feldspar glaze.  I have exchanged some of the feldspar for spodumene in order to minimize the crazing typical of the classic feldspathic glazes.  Color and a little opacity are supplied by copper carbonate and tin oxide.  This is a glaze for decorative pieces and has worked well for me with double dipping or with an additional application of flow glaze.

Feldspathic #3 Formula: Copper Green

 

K2Na2O .25

Li2O  .26

CaO  .49

Al2O3.  .52

SiO2.  3.25

B2O3.  .26

with 2.8% Copper Carbonate and 4% Tin Oxide

Feldspathic #3 Recipe: Copper Green



Custer Spar... 44.6

Spodumene... 28

Gerstley Borate... 10.4

Whiting... 9.2

Flint... 7.8

with 2.8% Copper Carbonate and 4% Tin Oxide