Anji Henderson on mon 18 oct 99
I acquired two books full of glaze recipes when I got
my wheel... I looked through them and they looked
pretty good, not only that but when I went to get the
wheel I looked at the wares that had been made with
these glazes. The look of the glaze was rather nice on
the clay body, which I also got a ton of... I was
reading one of the replies to something else (I think
the Hello letter) and it said that um, (I guess I
wasn't reading real hard) it said that something is
not good for white glazes, because of the high iron???
yea I think it said iron... Well, the white reminded
me, of the glazes...
OK to the point.... It is rather simple -- is there a
direct substitute for white lead.. That lead word, I
would definitely like to nix it before I even mix a
test batch......
Thanks,
Anji
http://www.angelfire.com/md/Anji/
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Ron Roy on tue 19 oct 99
Hi Anji,
In a word - no - unfortunatly - you do not say what temperature this is for
and that would help - the kiln all that stuff was fired in will have lead
in it forever though.
Boron is what is used to take the place of lead in glazes - mostly - and
it's soluble so you need a frit and get other stuff along with the boron.
The best solution for you is to ask for glazes - that look like the lead
glaze or what you want and start testing for fit.
What ever you do - don't start using a lead glaze untill you have it tested
- and even then if it tests out OK there are other problems - for you -
working around lead.
RR
>----------------------------Original message----------------------------
>
>I acquired two books full of glaze recipes when I got
>my wheel... I looked through them and they looked
>pretty good, not only that but when I went to get the
>wheel I looked at the wares that had been made with
>these glazes. The look of the glaze was rather nice on
>the clay body, which I also got a ton of... I was
>reading one of the replies to something else (I think
>the Hello letter) and it said that um, (I guess I
>wasn't reading real hard) it said that something is
>not good for white glazes, because of the high iron???
>yea I think it said iron... Well, the white reminded
>me, of the glazes...
>
>OK to the point.... It is rather simple -- is there a
>direct substitute for white lead.. That lead word, I
>would definitely like to nix it before I even mix a
>test batch......
>
>Thanks,
>Anji
>http://www.angelfire.com/md/Anji/
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
Anji Henderson on tue 19 oct 99
Eeeeuuuuue, I didn't think of the kiln.... Well,
luckily for me that I didn't buy a kiln from her
too... Hummmm, I wonder if she knows about the lead
thing??? Well, seemed that most of the things she had
made were covered containers that were being used for,
tomato juice, sorry that wasn't funny, just popped in
my head... Used for decoration...
Well, I was told that the glazes are for ^6, but I
haven't tested the clay completely yet.... Other
things take prevalence ... and I poke at this project
every now and then.. It just happens to be now again
for now... Hahahahahahaha, boy I went in circles....
Always do.. :)
I'm thinking a heck with it ... most of them could
probably be created close to memory with a shino, that
has been tweaked around a bit... And heck if I wait
long enough I will forget what it looks like any
way... Hahahahahahahaha
You say <have it tested>>
Oh, no worries, but thanks for the concern... Too many
circumstances, variables, and lawyers out there... No
even going to get far enough to have something to
test... :)
Thanks always Ron
Anji
--- Ron Roy wrote:
> ----------------------------Original
> message----------------------------
> Hi Anji,
>
> In a word - no - unfortunatly - you do not say what
> temperature this is for
> and that would help - the kiln all that stuff was
> fired in will have lead
> in it forever though.
>
> Boron is what is used to take the place of lead in
> glazes - mostly - and
> it's soluble so you need a frit and get other stuff
> along with the boron.
> The best solution for you is to ask for glazes -
> that look like the lead
> glaze or what you want and start testing for fit.
>
> What ever you do - don't start using a lead glaze
> untill you have it tested
> - and even then if it tests out OK there are other
> problems - for you -
> working around lead.
>
> RR
>
> >----------------------------Original
> message----------------------------
> >
> >I acquired two books full of glaze recipes when I
> got
> >my wheel... I looked through them and they looked
> >pretty good, not only that but when I went to get
> the
> >wheel I looked at the wares that had been made with
> >these glazes. The look of the glaze was rather nice
> on
> >the clay body, which I also got a ton of... I was
> >reading one of the replies to something else (I
> think
> >the Hello letter) and it said that um, (I guess I
> >wasn't reading real hard) it said that something is
> >not good for white glazes, because of the high
> iron???
> >yea I think it said iron... Well, the white
> reminded
> >me, of the glazes...
> >
> >OK to the point.... It is rather simple -- is there
> a
> >direct substitute for white lead.. That lead word,
> I
> >would definitely like to nix it before I even mix a
> >test batch......
> >
> >Thanks,
> >Anji
> >http://www.angelfire.com/md/Anji/
>
> Ron Roy
> 93 Pegasus Trail
> Scarborough
> Ontario, Canada
> M1G 3N8
> Evenings 416-439-2621
> Fax 416-438-7849
>
__________________________________________________
Do You Yahoo!?
Bid and sell for free at http://auctions.yahoo.com
Ron Roy on wed 20 oct 99
Hi Anji,
Cone 6 makes it much worse - lead is really volitile at cone 6 - and 6 is
the upper limit at which lead is used because it is so volitile -
everything in that kiln will be glazed probably - including shelves and
posts.
You would do her a big favour if you told her to get her blood tested - she
(they) may even be using the ware to eat off.
Good grief!
RR
>----------------------------Original message----------------------------
>
>Eeeeuuuuue, I didn't think of the kiln.... Well,
>luckily for me that I didn't buy a kiln from her
>too... Hummmm, I wonder if she knows about the lead
>thing??? Well, seemed that most of the things she had
>made were covered containers that were being used for,
>tomato juice, sorry that wasn't funny, just popped in
>my head... Used for decoration...
>
>Well, I was told that the glazes are for ^6, but I
>haven't tested the clay completely yet.... Other
>things take prevalence ... and I poke at this project
>every now and then.. It just happens to be now again
>for now... Hahahahahahaha, boy I went in circles....
>Always do.. :)
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
Jim Brooks on wed 20 oct 99
I have been told.or read that lead volitizes at about cone 6. If this is
true..fire the lead coated kiln to cone 7 and forget about it.. Perhaps Ron,
or someone with more knowledge can confirm or deny this.. It does raise a few
questions... I wouldn't want to breath it while it is firing..and what
becomes of the lead fumes.. or what ever it has become?..Thanks. Jim
ACTSNYC@cs.com on sun 24 oct 99
> Subj: Re: White Lead
> Date: 10/20/99 7:58:59 PM Eastern Daylight Time
> Jim Brooks wrote:
>
> ----------------------------Original message----------------------------
> I have been told.or read that lead volitizes at about cone 6. If this is
> true..fire the lead coated kiln to cone 7 and forget about it.. Perhaps
> Ron,
> or someone with more knowledge can confirm or deny this.. It does raise a
> few
> questions... I wouldn't want to breath it while it is firing..and what
> becomes of the lead fumes.. or what ever it has become?..Thanks. Jim
> ___
--------------------------------------
Lead volatilizes even at the lowest lead glaze temperatures. The amount of
lead that volatilizes increases with temperature. At cone 6 is it so volatile
that it almost "burns out" of the glaze. This means that the amount of lead
that converts to fume is great enough to significantly decrease the amount of
lead left in the glaze.
The lead fume created in the kiln will diffuse out of the kiln into the room
where it can be inhaled. Some will remain settled in the dust of the
pottery. Even more will recondense into the brick in the kiln and redeposit
on ware in subsequent firings.
By heating the kiln to cone 7, you will not get all the lead out of the kiln.
High firing will reduce by the amount that leaves the kiln and gets into the
air in the studio, but most will stay in the kiln and recondense. A good
negative pressure ventilation system like Envirovent should help remove the
lead. But even then, it will probably be several firings before tests will
not detect lead in the glazes fired in that kiln.
Monona Rossol
ACTS
181 Thompson St., # 23
NYC NY 10012-2586 212/777-0062
ACTSNYC@compuserve.com
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