Some of my work finally made it into the kiln last weekend for a first bisque firing:
- The top choices from my first 50
- several of the variations
- a set of very rough pots made from different wieghts of clay to gauge final sizes
I was sharing the firing with one of others from the studio, she did the programming and took them up to 1000.
To trial some glazes I then added the weight gauge series to Meg’s glaze firing, which she did to 1220.
I had ordered the materials for a gloss white and matt black glazes, but then found I had mistakenly ordered the wrong sort of feldspar so couldn’t make up the white. Meg loaned me her gloss white and I did some trials with the matt black, which is just managese oxide and china clay. The small ones were dipped, and the larger ones I painted on with a finger.
As you can see it’s not very black and not entirely matt- but it is quite interesting with it’s metallic fluxing effects. Mio has apparently used the same recipe as well with no trouble so I suspect that it may need a hotter firing.
One additional question remains – manganese dioxide is very toxic in its raw state – is it still toxic when part of a fired glaze??? Will have to find out before I do much more with it…