Dave Earley Posted July 11, 2021 Report Share Posted July 11, 2021 I am a hobby potter starting to do raku firing after many decades away from cone 10 functional work. I have a fair amount of kiln wash which I understand is half silica and half Kaolin. what can I add to make a raku slip? Link to comment Share on other sites More sharing options...
Bill Kielb Posted July 11, 2021 Report Share Posted July 11, 2021 Usually kiln wash contains a fair amount of Alumina so I would think at Raku temps it ain’t melting. Regardless of what it contains, I am thinking it doesn’t melt at cone 10 so for Raku, not likely. Not sure you could come up with a decent add without putting this in some glaze calc or progressively testing and adding Boron till it melted as a glaze. Link to comment Share on other sites More sharing options...
Dave Earley Posted July 11, 2021 Author Report Share Posted July 11, 2021 I read in Daniel Rhodes book Kilns about the ingredients although I suspected that there was alumina. I have about 20 pounds of kiln wash but don’t know what to flux it with. I also have some boraxo, a boron compound. Google says that melts at 743 C. Also called disodium tetraborate. What would be a good percentage to start testing? Link to comment Share on other sites More sharing options...
Mark C. Posted July 12, 2021 Report Share Posted July 12, 2021 I think its a losing battle -Just buy some new stuff-your time is worth something? Link to comment Share on other sites More sharing options...
Bill Kielb Posted July 12, 2021 Report Share Posted July 12, 2021 I agree, soluble boron not a fav either. Probably easier just to buy new or look up some recipes. Link to comment Share on other sites More sharing options...
neilestrick Posted July 12, 2021 Report Share Posted July 12, 2021 Use the kiln wash as kiln wash, start from scratch for raku glazes. Link to comment Share on other sites More sharing options...
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