peachblow pottery on sun 1 apr 01
To answer Iandol's question, back in the 60's and 70's Don Reitz was =
throwing everything and anything he could get his hands on into his salt =
kilns. Some metals vaporized at that temperature and others did not. =
Historically, brick and sewer pipe manufacturers would put zinc in with =
their salt. I was a student(still am) back in the 60's and had an =
interest in copper reds. I spent 10 years working with a copper red =
vapor glaze. I wasn't salting a glaze, nor salting a slip, I was =
vaporizing copper, salt, and tin, producing a copper red vapor glaze, 60 =
cubic feet at a time. There was 90% loss, but I also learned to refire =
adding more glaze build up therefore helping the reds to form. I learned =
alot about copper reds. It was all single fire porcelain in a high =
alumina salt resistant kiln. I was teaching at the time and the research =
was more important than the sales. A thesis was written in 1973 at =
Clemson University in Clemson S.C. Please remember that vaporizing any =
metal is lethal, take extreme care. Copper red vapor over a porcelain =
with 1/4 % cobalt produced gorgeous lavenders and purples. Almost every =
load was fumed in the cooling cycle with stannous chloride for =
irredescence. Also realize that if you throw metals into a salt kiln, =
you contaminate that kiln for firings to come. This actually helped my =
situation, but in a school situation the next load may not want copper =
or whatever else preceded it. If anyone tries this, just be extremely =
careful to not breathe the fumes during firing. I'm sure there are masks =
that would filter the vapors. Good luck. Tom Turner
Brooks Ratledge on sun 1 apr 01
Tom, I remember those pots and wish I had one. They were gorgeous! Grea=
t to see you're on clayart. Look forward to hearing more from you.
Patricia Harden (Penland '77, NC Potters conference, etc. - would love to=
see you again)
peachblow pottery wrote:
> To answer Iandol's question, back in the 60's and 70's Don Reitz was th=
rowing everything and anything he could get his hands on into his salt ki=
lns. Some metals vaporized at that temperature and others did not. Histo=
rically, brick and sewer pipe manufacturers would put zinc in with their =
salt. I was a student(still am) back in the 60's and had an interest in c=
opper reds. I spent 10 years working with a copper red vapor glaze. I wa=
sn't salting a glaze, nor salting a slip, I was vaporizing copper, salt, =
and tin, producing a copper red vapor glaze, 60 cubic feet at a time. The=
re was 90% loss, but I also learned to refire adding more glaze build up =
therefore helping the reds to form. I learned alot about copper reds. It =
was all single fire porcelain in a high alumina salt resistant kiln. I wa=
s teaching at the time and the research was more important than the sales=
=2E A thesis was written in 1973 at Clemson University in Clemson S.C. Pl=
ease remember that vaporizing any metal is lethal, take extreme care. Cop=
per red vapor over a porcelain with 1/4 % cobalt produced gorgeous lavend=
ers and purples. Almost every load was fumed in the cooling cycle with st=
annous chloride for irredescence. Also realize that if you throw metals i=
nto a salt kiln, you contaminate that kiln for firings to come. This actu=
ally helped my situation, but in a school situation the next load may not=
want copper or whatever else preceded it. If anyone tries this, just be =
extremely careful to not breathe the fumes during firing. I'm sure there =
are masks that would filter the vapors. Good luck. Tom Turner
>
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Des Howard on mon 2 apr 01
Brian
A neighbouring potter of many years back used to use
diesel fuel in blower powered "pot" burners,
he fed black copper oxide & salt into the air intake
of the blower. Fired to Cone 10, no copper reds as
I remember, but, the pots & the kiln bricks were
quite well glazed with an alkaline blue glaze.
No metal vapour!
Des
Brian Molanphy wrote:
> tom,
>
> thanks for the blast from the past. there are two points in your post that i
> don't understand; would you clairfy please. first, how did you vaporize
> copper, salt, and tin? did you place crucibles filled with metallic
> compounds in the kiln, or did you shovel the stuff in as in traditional salt
> glazing, or did you spray in a dissolved solution as in soda glazing?
> second, you remind us that vaporizing any metal is lethal. does this include
> sodium from sodium chloride or sodium carbonate? if so, why don't books on
> salt glazing include this grave warning? (perhaps i am a dangerously
> delinquent reader of such books...)
--
Des & Jan Howard
Lue Pottery
LUE NSW 2850
Australia
Ph/Fax 02 6373 6419
http://www.luepottery.lisp.com.au
friedlover on wed 4 apr 01
So now the question is, what kind of mask?
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