hi hank
thanks for the tip on your use of bone ash at 50%
im still looking at the uses of bone ash as the major ingredient, but began to back
away when finding that human bone ash wont even begin to flux until after 1,600C,
or cone 18 and higher
this is not realistic for doing a workshop,
so i have begun to concentrate on glazes that call for some ash, and found about a
dozen in nigel woods newest book, "chinese glazes" using from 4 to 6 % bone ash.
and also in matt copper raku glazes up to 20%
im looking for those glaze recipes that would embelish the opulacent qualities of
phoshorous, and will have out of the kiln next week several tests
yes, i would like to compare notes
thanks, noel
Hank Murrow wrote:
> Noel Mapstead wrote;
>
> >besides the pet bone ash being an opacifier, have use experienced getting
> >a blue
> >opal effect? either at raku temp or stoneware temp?
>
> >i have gotten some beautiful opal effects, but never everytime, hit and miss
>
> >i teach a workshop in feb 2001, using human bone ash for glazing.
> >currently doing
> >alot of research and experiments
>
> Dear Noel;
>
> I would argue the point about bone ash being an opacifier. Perhaps at
> lower-than-stoneware temperatures this is true; and I have little recent
> experience in that realm. At, and above C/10 however, I feel confident in
> claiming that the phosphorus content in bone ash is acting as a
> network(glass)former. In fact, I have done several Currie Tiles to
> demonstrate this behavior; and am currently using a glaze which contains
> 50% bone ash, and is lovely as a ware glaze, being both durable and
> beautiful, yielding rich tomato colors from Fe and Ru. Opalescence appears
> at C/12 with this glaze. I recommend you try some Currie assessment tiles
> to find out what your ash will do_____Let's compare notes, Hank in Eugene
>
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