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Showing results for tags 'sodium silicate'.
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Thought I'd share a success story here with my Terra Sigillata recipe. Everything I've ever read says that you need sodium silicate or sodium carbonate but it seems that Tetrasodium EDTA - aka Jet-Dry works as well. 3 parts Clay 1 part water 2 teastpoons Jet-Dry I used a small bottle to mix up a test batch as I wasnt sure that it would work at all. Previous attempts at using Calgon were unsuccessful as I read that the old recipe containing phosphates was changed. So, if you dont have sodium silicate or sodium phosphate handy you can give this a try and see if it works for you. Full post here - https://dreamsofearth.wordpress.com/2015/05/24/terra-sigillata/
My Standard ceramic Seamist glaze was going on too thick, even though the specific gravity was measuring ok. It was not settling out in the bucket at all upon standing. On a dipped piece, the glaze would take forever to dry, and would have cracking issues. In many hours of research (and reading at times what seemed to be contradictory advice) , it sounded as though the addition of sodium silicate should thin down the glaze, which is what I thought I wanted to do. I even watched John Britt's video showing exactly what sodium silicate does to his glaze that was behaving like mine -- his thinned down nicely. Mine, on the other hand, gelled up when I added sodium silicate! How could that happen? It seems counter-intuitive, and yet that's what happened. I'm hoping to salvage this bucket of glaze -- is there any advice that will help me? Thank you!
susieblue posted a topic in Clay and Glaze ChemistryI have become somewhat interested in the technique of creating texture on thrown pots using sodium silicate. i am curious to know if anyone has ever tried to use other materials to create a similar effect? I know it's easy to order the stuff online (when freezing isn't a concern) and I could make it myself from lye and desiccant. Just wondering if there is any other readily available liquid that offers a similar outcome. (I suppose I am being a bit lazy, too - who really wants to run out to Walmart when the temps are in the single digits, there's 2 feet of snow on the ground and the driveway's coated with ice?) Thanks.