I will do one more firing before doing the main wood firing. My goal this time is to see if I can get a good, traditional feldspar glaze. I last mixed up glaze about 3 years ago, 90 liters or so. In the intervening period the mix has been added to and has changed character enough that it is no longer what I would call a feldspar glaze.
I did another test firing that ended with me throwing everything in the photos away. I wanted to see if I could re-fire and fix the defects through heat and time. I had an explosion in the kiln and it spread fine shards and dust throughout the kiln, destroying everything. I have only had 2 things explode in almost 20 years of firing. It isn’t something I think a lot about but when it has happened I am surprised.
Here are the results of the firing I did to test the glaze I work with. The clay is new to me so it was necessary to see how it would work with the glaze. I also did some refiring tests which all worked out very nicely. I fired to a higher temperature than I usually do, about to 1,200 C.
I am going to do a test firing to see if I can correct some problems I had in a firing. The photos show the different problems. I have filled in with some extra glaze on the first one. The second bowl has a spot that has an unusual problem. It is a piece of paper I had placed in the bowl to identify the glaze before firing. I printed out the glaze type on a laser printer and then put the sliver of paper into the bowl. I didn’t bother taking the paper out of the bowl before firing and after I opened the kiln I found that the iron in the laser toner remained and had left a trace in the bowl. The third bowl has a similar problem but the debris is more pronounced. The last bowl is a more traditional problem of shivering in the glaze. I have put more glaze in the exposed area and will fire it again.
This is a bowl I bought this month. It is a tea bowl from the Kosobe kilns in the Takatsuki area of Osaka. This bowl is from the second in the line of Kosobe people that use this impressed seal which puts it in the 1791-1851 time frame. It is a Mishima type bowl and has 2 areas of kintsugi in it. Very beautiful and quiet bowl. Here is a site in Japanese that shows the signatures of the different generations. http://otokuinfomation.web.fc2.com/blog/index5627.html
I picked this up this week at an auction. It is a pot from the Momoyama period. The kamajirushi is listed in my blog post here, http://nanbanceramics.wordpress.com/2012/02/19/bizen-kamajirushi/
2 very interesting bowls.
The first one is a gokki tea bowl. kohiki, from the first part of the Richo/chosen period. It is very unusual to see slip ware from that period.
The second one has a pedigree. It was owned by the Mito branch of the Tokugawa clan. It is from the very beginning of the Richo/chosen period, older than the bowl above.
Here is another from the closing antiques store.
It is a Hagi tea bowl from about the Taisho period, about 1912-26 period.There is an impressed seal that is of this guy, http://hagi.jp/~y-kaji/modules/xfsection/article.php… . He is the younger brother of Miwa Kyusetsu, 三輪休雪 The seal is of 節夫, Sadao in Japanese pronunciation. Nice glaze with a lot of evidence that there was rice ash in the clear glaze. You can also see it here.
This is a tea bowl done the Douhachi family in Kyoto, see this for a Japanese page, this for an English explanation, under the ‘Later Edo period’ section. It is from the 3rd. to 5th. in the lineage so it is from the latter part of the Edo period.
Some things to notice about it are that the glazing is signed as well as the bowl. The bowl is difficult to discern but it is an impressed seal of ‘道八’ douhachi. The glaze signature I can’t read. Very nice, no chips. You can also see it here.