This is the teabowl that fell into the firebox during the last firing and broke into about 12 pieces. After falling and breaking, the firing continued, and the larger shards warped a bit, making it hard to get the pieces to fit just right.
Everything went back together, but some of the spaces were 1mm wide or more, and a lot of filling was required. Not only that, but the edges of the larger pieces didn’t meet evenly, making a lot of uneven fill lines. I thought about grinding down the higher edges, but in the end decided against that, because the fill lines were already so wide in some places.
So, here is the finished piece, with the lacquer and gold brushed on over the fill lines. A pro could have made thinner, more even lines probably, but it was good practice for me. A few more days to dry completely, then it will be time to whip up some tea…
All of these pots were made with clay from the property, discovered right under where we built the kiln. It has a lot of iron, but still takes some heat, and won’t bloat at higher temps. Probably due in part to the fact that it is very open with a lot of sand and other even larger inclusions. Even vitrified, it still sweats because of the openness. With use, the sweating stops, as all the pores fill with minerals from the water and tea tannins, etc…
Lately I’ve been spending all my potting time making large stuff for the next firing. It takes forever to dry, and I need extra time to bisque it all. Yup, all of it. No more cracked pieces because I glazed them raw and effed up.
So I was at a big drinking party the other night. My neighborhood mens group gets together bi-monthly to catch up and eat good stuff. A good custom overall. Anyway, the guy who hosted the party turned out to be a sake enthusiast as well, and while everyone else was drinking shochu (a hideous drink fit only for odd, uncivilized folk… just kidding….), he broke out a bottle of the local brewery’s best, and two very nice guinomi, one wide and shallow and one deep and tall. The hira-sakazuki (low, flat one) was a beautiful blackish red uber reduced surface, and made from really nice clay that contained quite a bit of iron, was fairly fine, and which was trimmed to perfection. The taller guinomi was Bizen Karatsu style, otherwise called yakishime. Neither were signed so I have no idea who made them.
hira-hai (hira sakazuki) and chawan
The gorgeous hira-sakazuki inspired me to get back on the wheel and start making smaller work for the next firing. I started with hira-sakazuki and finished with Karatsu style tea bowls. It was nice to be back in the saddle, and the clay, which came out of the ground near my house, was beautiful to work with now that it has aged a few months since I processed and pugged it.
I ended up spending more time than I wanted on each of these, forcing myself to slow down the wheel and throw slowly, with as little motion as possible. I wanted these simple shapes to remain simple and not look too refined. One of the buzzwords for Karatsu ware is ‘Soboku’ 素朴, which roughly translates as ‘rustic’. Too much handling and you lose that quality. Spent all of that time processing local clay, it would be a shame to waste it by over-handling it. All of these pots will get a thin to medium coat of 90%spar and 10%ash. Maybe a couple of the sake cups will get a thin coat of iron and ash.
This post is a photo record with comments, in order to organize and retain my thoughts and observations about the 8th firing of the wood kiln. I always think I’ll remember until the next firing, but never do. So, if you get into this, beware there are a LOT of pictures, some of which may seem redundant. There are examples of most of the pots from the firing, minus teabowls and some others which are not photographed yet.
The 8th firing was a charm overall, with many good pots, some bad, and some that will get refired. Kiln was fired in oxidation primarily. We stoked once every 30 minutes for 2 1/2 days, then once every 20 minutes the last half day.
– Front was nicely melted, nice even gradient to the rear of first chamber, E-Karatsu was about ideal. Cone 12 at hottest front down to cone 6 at coolest rear.
– Front chamber behaves like anagama. No significant temp gradient from front to back of each setting. Next firing, will pack kiln by eliminating the space between settings, leaving horizontal space for flame travel. One long setting from front to back of first chamber.
– Ame yu better at low temps. Load rear to mid chamber.
– Ao yu needs more heat, mid to front chamber.
– Large platters go midway to back of front chamber. Too much ash up front.
– Firebox wares are very nice in a three day firing. Great place for Shino, under cover to avoid ash in pots.
– Rear chamber fires fast when preheated for 3 days. Jumped from 1044C to 1344C in four stokes, a little over an hour. Care must be taken to spend more time soaking at high temp, because rear chamber high temp wares not quite mature (surface changes only), clay not melted well. Spend 3 or 4 hours firing off rear chamber, slowly, to get inside the pots.
– Rear chamber fires very evenly front to back, and top to bottom. Pick a temp to fire at and load accordingly. Don’t expect a significant gradient.
Hiura
Himae
Front of rear setting, front chamber
rear chamber, very hot
The whole bunch of it
rear chamber, top
firebox
firebox
firebox
front chamber, rear top of front setting
mid setting of front chamber
almost not enough heat for Ao-Yu
mid setting of front chamber
mid setting of front chamber
mid setting of front chamber
front of rear setting of front chamber,
clear over ame-yu works
mid setting of front chamber
mid setting of front chamber
mid setting of front chamber, more glaze shoulder level and higher
Very front, bottom
Very front, bottom
Very front, bottom
rear of front setting, bottom
rear of front setting, bottom
mid of front setting,
mid of front setting,
front of front setting,
mid of front setting,
front of front setting,
mid of front setting,
mid of front setting,
Tameike w/clear,
try taishu feldspar glaze next time
Tameike w/clear,
try taishu feldspar glaze next time
Tameike w/clear,
try taishu feldspar glaze next time
Hanjiki w/clear,
try taishu feldspar glaze next time
Tameike w/clear,
try taishu feldspar glaze next time
Hanjiki w/clear,
try taishu feldspar glaze next time
Ao-yu reacts strangely with Oshima white, too matte
Ao Yu on hanjiki,
Madara on Karatsu Daishizen
rear side
fire side
rear chamber, under fired. Soak at high temp necessary!
rear chamber, under fired. Soak at high temp necessary!
As I may have mentioned before, buying the pugger/mixer was probably the best decision I made last year. It has made my life easier in so many ways. However, it has made things more difficult in one way: it is hard to keep track of all the claybodies that go into the kiln. Especially after they are made into something and drying on the shelves, it is very difficult to tell them apart.
When I fired with the gas kiln, stuff didn’t pile up all that much, because I fired frequently. Now with the wood kiln getting fired 3 times per year, things tend to stack up, and labeling is essential to avoid hideous mishaps. I try to keep types of clay consistent from wareboard to wareboard and label each board, but packing pots in the kiln to bisque them means losing the labels and taking extensive notes, because bisqued clay looks even more similar than green.
The other day, I was wishing I had a way to label the pots better, then it came to me: a labeling app on my smart phone with which to label photos in my gallery. I downloaded a free app (there are lots of different ones), and viola!, pictures taken of my bisque load shelf levels are now accurately labeled and instantly backed up to my home network, so I know I won’t lose them.
Now if significant time passes between firings, or just unloading a bisque, I can refer to my pictures to figure out what everything is.
