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Hi there, I'm new on this forum and quite new to ceramics and glazes in general so please excuse my lack of knowledge... I've been making ash glazes using this Katherine Pleydell-Bouverie nuka glaze recipe; Mixed woodash 33.0 Feldspar 33.0 Kaolin 16.5 Ball Clay 16.5 On a recent trip to China I aquired some rice straw ash and I was really excited to turn this into a glaze. From what I read rice straw ash should be very high in silica too like other (mixed) wood ashes so I used the same recipe. The results came out rather different then expected or other wood ash based glazes I made using the same recipe. It looks like the glaze didn't melt or run at all. Please see photos for your reference. It seems like there is a lack of silica and fluxed present in the glaze. I want to do some line testing by adding silica in 10% increments and another one adding flux like gersley borate but perhaps somebody here sees something I'm missing or has other ideas. The other thing that could be possible is that I misunderstood in China and I've acquired rice HULL ash instead of rice straw ash. I'm firing in an electric kiln on 1240 degrees and have gotton desirible effects with mixed wood ash glazes based on the same recipe and firing. Thank you for any suggestions or advice.

I have a glaze recipe that calls for Koda A-4 feldspar. Can I substitute Minspar 200 for it?

Hi Guys. What is the latest changes on G 200 and or the HP? I saw some Spanish Feldspar somewhere at $3 per lb, which is way over what I would like to spend. I know Custer and the soda spars that is available, but before I make the final changes to some porcelain clay recipes, I would like to look at all the possible options. Thanks for any information. Antoinette TeachinArt.com PorcelainbyAntoinette

i just got a 50 pound bag of custer , and then find out the chemical makeup is all over the place , which means i have to spend 30.00 every time i get a new bag it should be up to the company to be on the ball mine a large stockpile and them provide the analysis keep consistency . i found three different analysis so now i don't know if any thing i am making is just a waist of time i now will have to dump all tests and the feldspar not going back to it what a bummer .