After my excursion from Wednesday to Friday I went to my aunts place right away to unload the kiln. It was already dark when I got there and the thrill of anticipation couldn’t have been bigger. After all it was my first glaze-fireing and who could’ve known what would happen in this black-box??? Continue reading
So yesterday was the kiln fireing. It is still cooling down. But it already has cooled down to 200 °C and even though my plan was to drive home today in the morning I couldn’t. There was still a mold to be made and one to be filled. So stayed and read the text i had to read for university in my studio between slipcasting and kiln-checking. I just worry a little about my trip to Münster tomorrow since it will start at four in the morning. But I’ll manage somehow I guess. And in the end I’ll at least have earned my weekend by then. It also means I increased the number of slipcast porcelain-branches a lot. And since I plan an installation of them it can’t hurt to start off having a couple of them. Also the mold now has time to dry out over a few days so I will be able to make another load of branches when I come back.
Also I made new testtiles. I already used up most of the ones I had for all the glazes I mixed while the kiln was cooling down. But since I recently read a cool article about copper reds chemically reduced by adding silicon carbide to the glaze, I needed more testtiles. Silicon carbide usually is used as an abrasive and comes in different grain sizes. John Britt mentions using rit 600 or 800 but other sources say the finer the better. So I ordered 800 mesh and 2000 mesh and will test away with that. I’ll also try to mix some foodsafe glazes from the transparent glaze I bought ready made at Carl Jäger and adding colorants to it. They said it was still food safe afterwards and I won’t need much colorant since I plan on getting the look of a celadon.
I did it! I fired my own kiln. Two days ago, on thursday. On my own. Well… I got some help loading it by Skylar. It was great having him over at my studio and being able to ask him all the questions I had. He seems to know everything =D
So we loaded the kiln and set a program. I did a slowish heating cycle of 6 hours to 650 °C and then a faster heating to 1000 °C where it soaked for an hour. I started the kiln in the morning around 9 and it was finished at about 6. The electricity usage went up drastically of course. The kiln almost used 150 kWh…. And although it cooled down all night it still needed another day and another night to come down to 120 °C. I was very patient though and waited till it had 60°C to crack the door open a little bit. The fear of distroying something after all the efford I put into it and the power used was too big. I tried to distract myself by making texture stamps and mixing tons of glazes. In total 14. Only to always wonder if my coppercarbonate was too coarse. Well turns out it actually IS too coarse. But nothing I can do about it now. I glazed stuff for two days and made testtiles with all the glazecombos I wanted to know how they turned out. I also glazed mostly the pieces that were a little too thick or not as centered or had other flaws, so it doesn’t bother me as much if the glaze turns out to be ugly. That said I did not really use a lot of my newly mixed glazes but mostly the four bought ones I know will work fine and at least not run. The kiln was loaded again on sunday and fired today. I am really, really curious how everything will turn out, especially because of the too coarse coppercarbonate. I imagine it will get green spots instead of an even distribution of the green in the glaze.