A fantastic glaze in principle, but it is not easy to get reproducible results. According to literature, the glaze should have a spec. gravity of 160 (1 liter glaze should weight 1.6 kg). It is mandatory to apply the glaze very thick and on both sides, to avoid tensions.
Author: Newsmaster
The simpler, the better: 80/20 Nepheline Syenite and EPK. Beautiful red-orange if applied thin (spray gun), no run-off at 1300°C if applied thick, does not crackle and can become very white. For your info: all experiments have been performed with Wittgert 11sf 0-0,2.
Shino Experiment 3: Penn State Shino
Variations of the flux. Penn State Shino: 14,6 Nepheline Syenite 34 Potassium Feldspar 29 Spodumen 9,7 Standard Kaolin 4,9 Hymod AT 7,8 Soda (calz.)
Shino Experiment 2: Shino Currie 2
A very simple recipe: Flux and variations of Kaolin. Shino Currie 2a: Standard Kaolin Shino Currie 2b: EPK Significantly more red with EPK, if applied thin (see also inside of the cup). If applied thickly, glaze is getting real white, as can also be seen in the picture, where it has been placed on top… Read More
Shino Experiment 1: RD Dry Shino #16a
First a test with variations of the iron content of the ball clays. RD Dry Shino #16a: Albany Slip RD Dry Shino #16: Hymod AT Bother are not so interesting (boring).
I tried 2 new blue slip recipes, as my previous experiments were not blue enough. Blue Slip 1: 60 Hymod AT 20 Potash Feldspar 10 Talcum 10 Flint 2 Cobalt Carbonate 2 Copper Carbonate Blue Slip 2: 60 Hyplas 71 20 Potash Feldspar 20 Silica 0,5 Cobalt Carbonate 2 Iron Oxide
Here now my conclusions: – The selection of the right ball clay seems to have more influence on the flashing effect than the Kaolin brand. – Zirconium Silicate and Borax are better flux than Nepheline Syenite. – Extra iron results in more brown than red. Finally, I decided for slip 1 (left in the pictures),… Read More
Flashing Slip Experiment 4: Addition of Rutile
One of the idea was, to enhance the iron-induced flashing effect with the addition of extra Rutile. Flashing Slip 4: +2% Rutile
Flashing Slip Experiment 3: Kaolin
Now different Kaolins have been used: Flashing Slip 5: EPK Flash Slip 6: Standard Kaolin Flashing Slip 7: Standard Kaolin, Zirconium Silicate, Borax
Flashing Slip Experiment 2: Flux
Standard recipe with EPK and Ball Clay with variation of the flux component. Flashing Slip 1: Addition: Zirconium Silicate, Borax Flashing Slip 5: Addition: Nepheline Syenite
Flashing Slip Experiments 1: Ball Clay Variations
Flashing Slip recipe with different ball clays but fixed other ingredients. Flashing Slip 1: Hymod AT Flashing Slip 2: Hyplas 71 Flashing Slip 3: HSM
Tessha glazes are characterized by their high iron oxide content.