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Everything posted by reneetje

  1. Thank you @C.Banks - really helpful again! I don't have rice straw ash that I'm certain of but can see if can get some through somebody else.
  2. @hitchmss Thank you so much for your reply as well. Your explanation of the flux and silica ratio is very helpfull! I'm using kali feldspar which I believe is the most commonly used feldspar in The Netherlands - where I'm based. And yes, you are right to assume I was talking about 1240 Celcius and not Farenheit! Should have stated this more clearly. Will go ahead with the two different suggested line tests (adding flux in 5 % increments and increasing feldspar & decreasing ash). Thank you!
  3. @C.Banks Hi and thank you for your response. Going to read the clayart post and will definitely try doing line tests with 5% increments of gerstley borate! @Tyler Miller That's what I thought - rice straw ash high in silica-, but judging the glaze mixture (in the photos) I thought the glaze seems to be lacking silica, or do you expect it's just a good flux that's missing?
  4. 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.
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