Bonnie Staffel on wed 30 aug 06
Dear Clayarters,
I was looking through some of my old papers today for something else and
found a recipe given out by Val Cushing at a workshop I attended in =
March of
1984. Copious notes were given out about slips and engobes as well as =
terra
sig recipes. This was dated before I went to NC to work at the JCCFolk
School and I can't recall where I went to see his workshop. =20
It is called Soldner's Fusable Engobe for Raku
"Kaolin (EPK or Tile #6 34
Flint 33
Gerstley Borate 33
=20
Copper Carb 50
Red Iron Oxide 50
You get the Ghost Track Shadow pattern white line around the brushed =
area."
Bringing back my own memories of my sawdust firing, my ghost was an ecru
color, not white. Please make a note of this. =20
Hope this helps. Now if I could only find the paper I was looking for =
in
the first place.
Regards, Bonnie Staffel
http://webpages.charter.net/bstaffel/
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William & Susan Schran User on thu 31 aug 06
On 8/30/06 6:20 PM, "Bonnie Staffel" wrote:
> It is called Soldner's Fusable Engobe for Raku
>
> "Kaolin (EPK or Tile #6 34
> Flint 33
> Gerstley Borate 33
>
> Copper Carb 50
> Red Iron Oxide 50
>
> You get the Ghost Track Shadow pattern white line around the brushed area."
>
> Bringing back my own memories of my sawdust firing, my ghost was an ecru
> color, not white.
I was told, many years back, the reason for the "white" line around the
brushed area is due to some of the flux migrating into the clay body,
sealing the surface to a limited extent, preventing carbon penetration from
the post-firing reduction. Perhaps adding additional low fire fluxes to the
recipe might re-enforce this effect.
In any case, I would expect the engobe to change to a brownish color over
time.
-- William "Bill" Schran
Fredericksburg, Virginia
wschran@cox.net
wschran@nvcc.edu
Bonnie Staffel on fri 1 sep 06
Jim, the additional amount of oxides is correct to be added to the base as I
posted originally.
In my own "black marking" (which I call my recipe) has the oxides only with
the addition of the frit to give it more melting qualities.
Regards,
Bonnie Staffel
http://webpages.charter.net/bstaffel/
http://vasefinder.com/bstaffelgallery1.html
DVD Throwing with Coils and Slabs
DVD Beginning Processes
Charter Member Potters Council
Jim Brooks
Subject: Re: Soldner's halo slip Attn: Bill Schran
Bill , your email on Soldner's Slip shows 50 % of copper carb and 50%
for
Red Iron Oxide Is this correct or am i reading it wrong.? Based on a
100 gr batch i would add 50.0 grams of each ot the oxides?
Thanks jim in Denton............
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