Thursday, November 02, 2006

I may have finally found a glaze that will give me a good green on the red Lizella clay. A couple of weeks ago I made 4 more test batches of test glazes and this past weekend I fired 4 pots with those glazes plus one glazed with a Warm Jade Green glaze that I have but don't use very often.

There results are as follows:

#7 - Clear Glaze with Chrome and Tin. Clayart member Russell Sheptak suggested that that I try a clear base glaze and add 2% - 5% chrome oxide and maybe some tin oxide to get a lighter green so I did that using the clear glaze I use. This is the glaze I will probably use. The color I am looking for is in the middle of the pot of this test where it had 3 coats of glaze. I will do further testing with it. I got the clear glaze receipe from Patty Caldwell but I don't know where she got it.
Gerstley Borate 50
EPK 17.5
Flint 32.5
Chrome Oxide 5
Tin Oxide 5
SG = 1.39



#8 - Hunter Green. Receipe provided by Colleen Rayner. I reduced the cobalt carbonate to 7.5%. I will try this glaze using 5% chrome oxide and tin oxide as an alternative to the one above that uses the Gerstley Borate.

Dolomite 20
Frit 3134 20
Spodumene 20
Ball Clay 20
Flint 20
Cobalt Carbonate .75
Chrome Oxide 2
SG = 1.46



#9 - Hunter Green. Receipe provided by Colleen Rayner
I replaced the cobalt carbonate with tin oxide. It worked exactly as Miss Lili said it would.

Dolomite 20
Frit 3134 20
Spodumene 20
Ball Clay 20
Flint 20
Chrome Oxide 2
Ton Oxide 2
SG = 1.48

#10 Emerald Green with Soda Ash
I reduced the cobalt carbonate to .375%

Gerstley Borate 49
EPK 19
Flint 32
Soda Ash 2
Chrome Oxide 2
Cobalt Carbonate .375
SG = 1.37


#11 Warm Jade Green - I think I got this receipe from John Hesselberth at his talk at NCECA in Charlotte 2001.

Custer Feldspar 22
Frit 3134 16
Whiting 12
Talc 9
EPK 20
Silica 21
Copper Carbonate 3
Rutile 5
SG = 1.5