Linda Stauffer on tue 9 dec 97
I have a cone 6 oxidation glaze that I love. I am very fond of the warm
cinnamon color and the surface quality of the glaze. The only problem is
it has lead in it and I am unable to purchase any more lead. Does anyone
know how to change this formula?
Feldspar 66
White Lead 30
Dolomite 21
Whiting 12
Kaolin 30
Flint 10
Albany Slip 28
Tin Oxide 14
Add 3% Illmenite (stir in by hand)
For Cinnamon add 1% Rutile and 2% Iron Oxide.
I use Standard Caly body #205
George Mackie on wed 10 dec 97
Linda- forget it ! You could take the lead out and substitute a non-lead
frit but it would never be the same. Thats the tragedy of these lead-free
times. The beautiful and unique effects of Pb in glazes can't be
duplicated.
Where do you live? Ive got lots of white lead- more than I
will ever need and could send you some.
Its ok to use lead glazes for the outside of pots and for
non-eating/drinking surfaces provided you are careful not to inhale the
dust when making up the glaze. George
Linda Stauffer on wed 10 dec 97
George,
I live in Eastern Pa, about 60 miles N of Philadelphia. I can't find a
source for lead in any of the catalogs. Does anyone know where I can
still buy lead?
George Mackie on sat 13 dec 97
On Wed, 10 Dec 1997, Lauren Ball wrote:
>> Its ok to use lead glazes for the outside of pots and for
>> non-eating/drinking surfaces provided you are careful not to inhale
>> the dust when making up the glaze. George
> Wrong, it also coats your kiln and it can never be used for functional
> ware. The fumes from the kiln are also toxic contaminating you
> house,yard and neighborhood.
> Don't use it. It will hurt someone.
> Lauren
Lauren - I think I'm right in saying that vaporization of lead only occurs
above cone 7 so for people doing low-fire work it shouldnt be a problem.
Lead is dangerous stuff, no question about it, but properly used it is
still a valid glaze ingredient. I kept an earlier posting from a person
who specializes in environmental hazards and paste it in below. George
( from Monona)
You can make all the lead glazed ware you want if you follow FDAs rules.
These are the choices.
1. Formulate the glazes so they will pass current FDA leach limits or the
stricter California limits if you sell there.
2. Use lead glazes that leach like crazy but drill a tiny, unobtrusive
hole in the piece so it wont hold water and can't be mistakenly used for
food or drink.
3. Use lead glazes that leach like crazy, but fire a decal on the bottom
that warns people (you have to use the wording mandated by FDA)
So if the artistic form and look of the piece is your aim, there is no
problem.
Monona Rossol, industrial hygienist
Arts, Crafts and Theater Safety
181 Thompson St., # 23
New York, NY 10012-2586 212/777-0062
http://www.caseweb.com/acts/
>
Lee on sun 20 nov 11
On Sun, Nov 20, 2011 at 2:41 PM, tony clennell wr=
=3D
ote:
> I enjoyed reading the posts on lead. I'm hoping to be back in the
> studio in January and will be working on reinventing myself as a Cone
> 04 e-ware potter.
Tony, consider firing higher. To cone 1.
> Each test tile has a white slip/ my AT slip and trailed with a copper,
> cobalt, red art, and brown/black ( yeah it's manganese slip ) so each
> test tile will carry a lot of information.
Check out Linda Arbuckle's majolica handouts. I've been using her
amber and green glaze along side Pete Pinnell's terra sig and also her
majolica. The majolica, when used thin, is rustic, like French
woodfired Jaspe' They say cone 3, but I have been firing them to cone
1
Find them here:
http://lindaarbuckle.com/arbuckle_handouts.html
--=3D20
--
=3DA0Lee Love in Minneapolis
http://mingeisota.blogspot.com/
=3DA0"Ta tIr na n-=3DF3g ar chul an tI=3D97tIr dlainn trina ch=3DE9ile"=3D9=
7that is, =3D
"The
land of eternal youth is behind the house, a beautiful land fluent
within itself." -- John O'Donohue
tony clennell on sun 20 nov 11
I enjoyed reading the posts on lead. I'm hoping to be back in the
studio in January and will be working on reinventing myself as a Cone
04 e-ware potter. The pots of my aunt and uncle's from the early 40's
and 50's that were gas fired lead glazed have a depth of glaze that is
unparalled with fritted glazes. The glazes I am attracted to have
manganese and copper additions.
Uncle Jim had a manganese lead glaze called Dark Northern Lights that
was this glaze with trailings of yellow, turquoise and white that ran
and bleed into the manganese lead glaze.
On Saturday I spent time with a student making e-ware test tiles.
Trying to come up with a Medieval slip for English slipware. Used AT
ball clay(high iron) that I have been carrying around for 20 years.
Each test tile has a white slip/ my AT slip and trailed with a copper,
cobalt, red art, and brown/black ( yeah it's manganese slip ) so each
test tile will carry a lot of information.
There was a little thrown piggy bank with a beautiful yellow clear
glaze over a slip at The Royal Ontario Museum. I told all my students
if you can duplicate that glaze/slip from the 1500's you get an A+. I
will copy and steal it.
Ciao,
Tony
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