Phoebe and I fired a raku kiln together yesterday and I put in a couple of my thrown forms. The first is a white st thomas ‘moon jar’. The duck-egg blue raku glaze came out a bright light blue with crazing however the stoneware reduction glazes I applied came out a rusty colour from the red iron oxide and a matte dark green, possibly from the presence of copper carbonate. The earthenware cream glaze inside came out a much brighter colour because it matures at a lower temperature. The effect looks a bit like an abstract upside down landscape or a globe. We left the pots in the flames for 1 hour 15 mins then placed them to smoke and reduce in sawdust, shredded paper and hay for 1 hour. To get even temperature around the kiln chamber I’ve learnt to cover the top on the side which is coldest with a piece of kiln shelf as this adjusts the air flow.
The rounded form was inspired by the work of Adam Buick although I’m struggling to make perfectly spherical shapes. It’s clear from these photos the footrings on his are a lot narrower than the top which elevates them. This article has a little information about moon jars and their contemporary re-interpretations.
Inspired by Cait’s sake cups from the Pottery throwdown on Thursday I tried wrapping copper wire around this mug (reduction st thomas clay). The surface is painted on duck egg -blue with lines cut through sgraffito style with a needle point tool. I like how the glaze has blistered and crawled dramatically on the side exposed more to the flames in the firing. The copper wire turned black and fused somewhat to the glaze but other than that didn’t leave any trace. It was interesting to watch Hannah from L5 spray alcohol onto her vessels to create varied surface colours. I’m going to try and get hold of the Lark ceramics book ‘Alternative kilns and firing techniques’ from the library to find other raku firing techniques to try.