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About Suzanee

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  1. Disposal of old glazes

    As already mentioned metal oxides are very bad for the environment and the only way to dispose of them is to fire them but this is not easy if you have a lot. I accumulate a lot and have never needed to through any glaze 'away'. My students are encouraged to dispose of their glaze waste into a bucket which when full is mixed,sieved and test fired. If the result is not to my liking I dry some of it out in order to accurately be able to reproduce the effects. All the glazes that are mixed should have the same firing temperature. To the first test I will add 10% quarts or flint to the second 20%.To the third test I will add 10%whiting to the fourth 20%. From these results you will know in which direction you want the glaze texture to go - matt or shiny. To make the glaze darker add iron or manganese or intensify the colour it is already leaning towards. If you want a lighter colour use titanium dioxide or zirconium, test within the standard amounts for each material but also go a little above recommended levels, the results can be very surprising. If the glaze melts well but has an ugly colour try adding 5,10,15,20% lithium or 10,20,30,40% barium carbonate, you will get a range of good glazes. I expect to get a good glaze from four test firings and it will have cost you very little as well as knowing the environment is not put at risk. Warning; testing can become addictive!