Firstly, I am feeling very grateful to NZ potter Peter Gregory for sharing his high fired glaze recipes. I was especially excited to find Peter's glaze page because many (most) of the glazes he details are fired in his electric kiln with good results. Until now pretty much all the glaze recipes I'd found on-line were for reduction firings, and I rely on a firing service with only electric kilns. I have made up a couple of Peter's recipes - his 'buttermilk' and also 'black tenmoku'. The above examples show buttermilk on the outside and the inside has the two glazes layered (buttermilk on top of tenmoku).
I'm enjoying the dappled and streaked effect of this glaze combination but not sure about this on the inside of a tea/coffee cup ... maybe a bit too close to looking mouldy or like curdled milk in your tea? (thoughts, anyone?) On the outside of a cup might be better, but I'm hesitating because it looks like it has run down the inside quite a bit (I dread the shame going to the 'work to pick up' shelf and finding mine is the work still fused to the kiln shelf!). A small test to the upper part of the outside surface... yes, that'll be the next of my seemingly endless experiments. (Oh and I did also try the Tenmoku on it's own but wasn't so keen on it - a bit too glossy and not as black as I'd hoped... maybe I need to have it thicker to get a better result).
Speaking of experiments and on-line learning resources, another recipe I tried out recently was for a coloured wax resist. I get the Ceramics Arts Daily email updates and I reckon I pick up a couple of good snippets of information each week from looking at these. A couple of weeks back they had something on resists including a coloured resist recipe involving iron oxide, cold wax resist and Gerstley Borate. You can see the results of my experiment with this on the three pieces shown below (also featuring above-mentioned glazes). I'm really taken with this. The only problem I'm having is getting some sense of control of the brushwork - it's quite tacky and I can't seem to get a nice smooth brush line, even a thick one. I had hoped to be able to use it for finer detailed work. I think I'll try some different brushes, and thinning down the resist. It wrecks the brushes though.
Be sure so check out all the other clay action on Mud Colony this week!