In amongst a batch of ceramic materials & equipment I bought from a potter who was going travelling are two buckets of mixed, liquid glaze. One is a 'matt turquoise blue' the other 'black'. This was a hurried purchase as the young lady was leaving the country the following day and I'd already taken up an hour of her time sorting through her garage! She told me that the black was very runny, and to be careful, and it is labelled as such. I don't know if these are earthenware or stoneware glazes, they were her own mixes. A couple of questions. ( I do plan to test, test, test. ) I currently use a smooth white earthenware, fire in a small electric kiln., glazes usually to 1060/1080oC
1 - what will happen if they are stoneware glazes and I use them on white earthenware firing to earthenware temperatures.
2 - as I already know the black is runny, other than only using it on a rim and expecting it to run, is there anything I can add (without having any idea of the original recipe) that will make it less runny?
3 - what would happen if Earthenware is fired above the recommended temperature? E.g. If I bisque an earthenware piece to 1000oC then glaze to a stoneware temperature?
Many thanks, in anticipation.
Celia UKMember Since 01 Jul 2012
Offline Last Active Yesterday, 04:43 PM
I am a retired Primary School headteacher. I have set up a home studio and continue to develop my throwing skills. I like to alter, carve and incise my pieces, being more interested in shape, design and form, than colour and glaze finishes. I am currently working in smooth, white earthenware and would eventually love to move on to porcelain once I feel my skill level justifies the cost! I have a small electric kiln with digital controller, which has enabled me to eliminate glaze crazing issues. I prefer the smooth, matte finish of my bisqued ware, to glazed pieces, and am yet to find simple matt / satin glazes that add protection without detracting from the unglazed form. I am on the brink of starting to mix my own glazes, which I hope to get into after going on a glazing day with a professional potter in September.
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