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lead glaze substitution

updated mon 28 apr 03

 

Ron Collins on sat 26 apr 03


I have been commissioned, if I accept it, and can reproduce it, to do a =
very large set of dinnerware in a spanish colonial style, actually =
medevial....to be exact, the style of current pottery of UBEDA (Jaen) in =
Spain. I have the photos and a piece of the real deal....the question:

It is the typical green lead glaze of half terra cottaclay, half red =
lead oxide, over a white slip on the interior of the plates, orange =
clear glazed terra cotta on the outside with lots of carving, incising, =
and cutting/exacto work...I can duplicate the glaze exactly, but don't =
want to have to......that many pieces, glazed with lead oxide, I don't =
want.....because if they want more pieces later, then here we go =
again.......but the characteristics of the glaze are not easily =
duplicatable....fluid, runny, but not, irridescent patches. I know that =
I can't get this glaze if I don't use lead, but the question is:

Has anyone done research on a substitute, as a reproduction piece, of a =
lead glaze on terra cotta, fired 06, or 04 or so, ...that is the pretty =
lead green, but eliminates the lead? =20

If so, could we please communicate? It is for the former president of =
the country for his authentic 16th century colonial home, and the =
completion of this commission would help my business here tremendously. =
If it was for anyone else, I would say that I don't do that type of =
work, but the idea of reproduction, spanish colonial 15th/16th century =
terra cotta, or it's predecesor, has a place here that might be =
interesting to pursue, and this commission definitely is. =20

If those who know me, and have something to offer or would be willing to =
share any research, it would help me get going on the prototype set....I =
think I can alter it to fit the terra cotta body that I will have to =
come up with.......but I need some help..............Melinda Collins, =
Antigua, Guatemala

Snail Scott on sun 27 apr 03


At 08:28 PM 4/26/03 -0500, Melinda wrote:
>Has anyone done research on a substitute, as a reproduction piece, of a
lead glaze on terra cotta, fired 06, or 04 or so, ...that is the pretty
lead green, but eliminates the lead?


I've made some medieval-style terra-cotta stuff just using a
cocktail of a few Duncan low-fire transparent greens (local
shop didn't have enough of just one) mixed with a bit of
their clear glaze for more transparency. It makes for a
not-too-bad approximation or the look and skips the lead,
but of course has the same absorbency and crazing issues as
the originals.

Sorry I can't provide a raw-materials recipe.
-Snail

Dewitt Gimblet on sun 27 apr 03


>At 08:28 PM 4/26/03 -0500, Melinda wrote:
> >Has anyone done research on a substitute, as a reproduction piece, of a
>lead glaze on terra cotta, fired 06, or 04 or so, ...that is the pretty
>lead green, but eliminates the lead?

You might want to look at the Pete Pinnell article from Claytimes -
"Glassy Glazes Without the Lead," 2002 May/Jun:38-39

deg