vivk
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Morning all. This is probably a basic question to many of you , but my Chemistry knowledge is not great and I would appreciate some help. Is it possible to change an earthenware clear gloss glaze (firing to 1100 centigrade) to a higher firing stoneware glaze (firing to 1200 centigrade) without knowing the formula of the original glaze. I am sure this question is answered in Digital Fire or somewhere on this forum, but I am feeling a bit lazy to search through- got too much playing in the studio to do!
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Have you tried firing it up to 1200 and seeing if it works? Some glazes can have a wide 'workable' range.
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I have used thin coatings of commercial earthenware clear glazes on bisque ware fired to cone 10(reduction) without problems. The earthenware glazes matures (fully melted) at about the same temperature as bisque firing; this means that the ware surface is quite porous when the glaze melt forms and the melted glaze soaks into the surface pores. The effect is generally a thin transparent covering with some gloss. The surface is visually smooth while the clay surface fine markings are still tactilely available. Keep the application thin until you have data on maximum allowable thickness for your work and firing situation.
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