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old glazes/ lead freakout????

updated mon 8 feb 10

 

David Woof on sat 6 feb 10


Let's not freak out!!! but we are still using Lead if we use a lead frit w=
=3D
hich is raw lead fritted with silica and so makes it safer to handle when w=
=3D
eighing=3D2C mixing=3D2C and applying as a glaze. But what happens to that =
mode=3D
rn "safe" fritted lead glaze while it is being fired to temperature and spe=
=3D
wing fumes throughout the kiln and the outside environment=3D2C including t=
he=3D
neighbors kids playing "safely" in their yard downwind from your kiln vent=
=3D
? =3D20
=3D20
Or have you considered that a lead glaze made the old way=3D2C by combining=
r=3D
aw lead and silica in a glaze formulation=3D2C is also in a "fritted" state=
w=3D
hen the fired glaze is cooled and removed from the kiln?=3D20
Granted=3D2C we can formulate glazes that leach lead within "acceptable" li=
mi=3D
ts=3D2C but what is the substantial difference between old and new except s=
af=3D
er handling while mixing and applying???
=3D20
For the record: I don't use lead in any form=3D2C fritted or otherwise. H=
ow=3D
ever I am much more concerned about monosodium glutamate=3D2C melting glaci=
er=3D
s=3D2C and a prevailing scotoma that prevents so many otherwise bright peop=
le=3D
=3D2C mired in divisive religious and partisan thought=3D2C from seeing the=
wid=3D
er and deeper things beyond. Lead won't be what kills you unless you star=
=3D
t shooting each other. =3D20

=3D20

David Woof

=3D20


=3D20
9b. Re: Old glazes
Posted by: "Randall Moody" randall.moody@GMAIL.COM=3D20
Date: Mon Feb 1=3D2C 2010 4:59 pm ((PST))

On Mon=3D2C Feb 1=3D2C 2010 at 1:40 PM=3D2C lili krakowski link.n=3D
et>wrote:

> The one repeated warning about old glazes=3D2C as well as stains=3D2C is =
that=3D
many
> contain ingredients--such as lead=3D2C and antimony-- which we no longer =
us=3D
e.
> Lili Krakowski
> Be of good courage
>

How old are we talking?!? When was the last year that glazes contained lead
and antimony? I seriously doubt that the average glaze on the shelf of your
local potter supply=3D2C even if considered "out of date" is old enough to
contain lead or antimony without a very obvious warning on the label.

--
Randall in Atlanta
=3D20

=3D20




=3D20
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May Luk on sun 7 feb 10


Hello all:

I just finished watching the DVD "Pottery of the Ethnic Minorities in
Southwest China". Some uncivilized potters still make glaze from
stir-frying lead bits to get glaze and dip their bare hands in the
glaze and they are very OLD. (I doubt it that they started their
business a few years back, poor potters in rural China got to be
lifers)

Then I read that fear of disease, including syphilis and the Black
Death put water out of fashion. Nobody bathed or washed a few hundred
years ago in Old Europe. If you take a bath, you might die. Imagine
that!

Lead would never be back as glaze ingredient in this country, but fear
is always in fashion.

"I watch a lot of Tru TV" May
Brooklyn NY
Once again, as you all know, any poisoning is about how long and how
much exposure.

On Sun, Feb 7, 2010 at 1:43 AM, David Woof wrote:

> For the record: =3DA0I don't use lead in any form, fritted or otherwise. =
=3D
=3DA0However I am much more concerned about monosodium glutamate, melting g=
la=3D
ciers, and a prevailing scotoma that prevents so many otherwise bright peop=
=3D
le, mired in divisive religious and partisan thought, from seeing the wider=
=3D
and deeper things beyond. =3DA0 Lead won't be what kills you unless you st=
ar=3D
t shooting each other.
>
>
>
> David Woof
>
>
>
>



--=3D20
http://twitter.com/MayLuk