Craig Martell on tue 7 aug 01
Hi:
Since having a discussion with Ian about the volatile nature of fluxes,
I've decided to do a sort of barnyard experiment. I've prepared tiles to
go into the next firing, which will be at the end of the week. The tiles
have been set with soda and potash feldspars, whiting, and woodash. I'll
place a tile above the tile bearing the samples with a small gap separating
the two. I'll fire them to cone 10R and then check the underside of the
top tile for flash marks etc. I'll post my results to the list, and
judging from the interest so far, folks will be waiting from here to Tierra
del Fuego for the results.
regards, Craig Martell in Oregon
Mert & Holly Kilpatrick on tue 7 aug 01
Craig,
I'm a little out of the path from Oregon to Tierra del Fuego, but I will be
interested. I did some tests in our last ^6 electric for volatilization. I
like the glazes that volatilize onto the unglazed foot or rim parts, so I
lined up a bunch of pots to see which glazes had that effect the most
strongly. Some of the common denominators in those glazes seemed to be
lithium, rutile, neph sy, frit 3110, and strontium carb. A little
consulting with Hamer brought up copper, boron, sodium and zinc as
high-volatilization fluxes. I had a few little pinch bowls bisqued, so I
mixed washes of spodumene, frit 3110, neph sy, rutile, and lithium carb, and
brushed them on the little bowls, and set them on tiles, because I wasn't
sure if they would stick. The spodumene bowl came out quite brown, but the
only one that had that nice toasty look was the lithium carb. But that
little bowl broke at a touch into many pieces - due to expansion
coefficient?? But I think I didn't do my test properly, because I brushed
the entire surface, and the volatilization effects show on bare surfaces,
and I didn't leave any.
I will work with it some more. I have tried a wash of iron, or iron and
manganese, but that isn't exactly what I am looking for - I don't like how
the coverage variations show up. I was hoping I could use a light coating
of something that vaporizes alot, and create the vaporization effect.
Holly
in PA. Very humid, many fans blowing.
----- Original Message -----
From: "Craig Martell"
To:
Sent: Tuesday, August 07, 2001 1:28 PM
Subject: woodash and volatiles
> Hi:
>
> Since having a discussion with Ian about the volatile nature of fluxes,
> I've decided to do a sort of barnyard experiment. I've prepared tiles to
> go into the next firing, which will be at the end of the week. The tiles
> have been set with soda and potash feldspars, whiting, and woodash. I'll
> place a tile above the tile bearing the samples with a small gap
separating
> the two. I'll fire them to cone 10R and then check the underside of the
> top tile for flash marks etc. I'll post my results to the list, and
> judging from the interest so far, folks will be waiting from here to
Tierra
> del Fuego for the results.
>
> regards, Craig Martell in Oregon
>
>
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