Adjusting the localized chemistry with ash from a botanical that contains magnesium is enough to push the glaze in the right direction. If you look at the image in Peter’s reply just above mine here, you can see that there are tiny yellow specks in the glaze, meaning that one is probably already susceptible to turning that particular gold colour. There’s more, but that’s the Cole’s notes version if you don’t want to read the blog.
He was fine tuning the rate of iron crystals by altering the amount of magnesium and calcium. Joe at Old Forge Creations did this blog post last September about some chemistry explorations he did with a black tenmoku recipe that formed yellow crystals. Some of the colour response is going to come from the change in the fluxes in that really localized area, and some of it would come from the additional iron, chrome and manganese. I don’t think the artist who made the pot in your supplied image is applying overglaze: I think they’re just putting a leaf on a glaze that’s got the right chemistry to be inclined to turn that gold colour when the ash from the leaf melts into the right spot. PS It would be interesting to know the analysis of the ash of other leaves traditionally used for leaf bowls. and then looks at the effect of firing temperature. It then considers the use of this overglaze which it uses with a celedon base-glaze.Ĭombine with celadon's mud glaze to make no less than 6 sets of test pieces, (I'm not sure if it is applied it as an overglaze, or mixed it with the celedon.) It starts by analysing the mulberry leaf ash as it is heated, and comes up with a glaze formula:Īny thoughts on the colouring mechanism? And is it a property of the overglaze alone, or a reaction with the base-glaze? This paper thinks of the leaf as a way of applying an over-glaze image to the pot. The image on a good leaf bowl is notable both for its fidelity and its colour. Research on the New Woodleaf Glaze in Celadon I welcome others interpretation of this paper (pity it doesn't have a pictures) Google translate into Chinese (traditional) gave leaf bowl => 葉碗Ī google search for images then gave a few hits, the first of which was Edited by PeterH John also sold an ebook containing this and other articles, don't know if it's still available. The article appeared in print (no idea about the Japanese symbol) Which sadly gives lots of images of leaf-shaped bowls!
Google translate gave leaf-bowl => リーフボウル Nevertheless, this gave me some excellent techniques to try. Today Google will translate text for you but not images and some of these were photos of newspaper articles. Although I could not read them, I could deduce what was being done by the pictures. I was excited, saved these articles and printed them out. Several others led to newspaper articles allegedly describing the technique. I started to click the links and many connected to museums and historic books, while others led to blogs of people who, like me, wanted to figure it out. () I copied and pasted these symbols into Google and found a lot of information, unfortunately written in Japanese, which I cannot read but, being a visual learner, I decided to click 'Images' and voila-thousands of images of the leaf bowl instantly appeared. Then, while on Facebook, a Japanese woman named Mia Ishiguro (no relation to Munemaro) noticed that I was researching the leaf bowl and having trouble, so she sent me the symbols for 'leaf bowl' in Japanese. The quest for the illusive leaf bowl: John Britt describes his search for an ancient technique.
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