Speaking of Nuka. I got some great information from my friend Lance who is continually learning things about the beauty of the world and he creates videos to educate on his findings. He talks about “the living fossil” : Equisetum, which was around in the days of the dinosaurs. It is edible and has medicinal properties but what struck me was that it is very high in silica.
Since rice husk ash is used to create the beautiful nuka glaze. Its color is not easily describable but it has shades and hues of blue, green, white and grey. Every nuka glazed pot is different. I think that the somewhat random nature of the glaze is one of its greatest characteristics.
Look at this beautiful square bottle by Shoji Hamada Sensei using nuka over black glaze. Exquisite!
I have a theory about my own work: that it needs to have an element of control (shaping the clay) and an element of relinquishment (letting the fire do its thing). And since my shapes are so simple, the two need a perfect balance.
Miranda Forrest published a book called Natural Glazes: Collecting and Making in which she describes the glaze using horsetail:
“The first test with horsetail ash alone produced a melted, creamy, greenish glaze with an optical blue in the centre, perhaps the most interesting single land-vegetation result to date. It also mixes well with other ashes and rock dusts. One of the other interesting effects associated with horsetail is carbon trapping during the firing, which gives a dark smoky colour to the glaze in places.”
Very very interesting! I’m all about local materials and making work that is harmonious with nature. After all, nature gives us what we need to live, to thrive and to create. Working with clay is a very primal type of creation for me.
I read somewhere that Shoji Hamada Sensia made nuka using the following
1/3 rice husk ash
1/3 wood ash
1/3 terayama stone ( a high silica bearing feldspathoid)
The highly respected Michael Coffee uses the following:
Custer Feldspar 36.00
Quartz 30.00
Whiting 22.00
OM-4 6.00
Wood Ash (unwashed) 3.00
Talc 2.00
Bone Ash 2.00
Another potter, Steve Mill uses
Silica 40
Rice Straw Ash 50
Feldspar 60
I plan to start somewhere along the lines of the simpler one and work from there. Now… Horseail grows in very wet conditions. It favors clay (how appropriate!) It’s summer. It should be around somewhere. I just have to find it 🙂 (then burn it, then wash it, then test it, etc…)
FireCrown Pottery 