Bill Merrill on mon 4 may 09
Muriatic acid does work. I use it in glazes that I don't want not to
have runs on the glaze. When the acid is adde4d to the glaze it has a
pudding like consistency. The water content in your glaze will
determine the feel of the glaze. If you have ever seen Victor Babu's
large porcelain platters, the glaze he dips those platters has muriatic
acid in it. He uses large custom made dipping tanks and dips the pot
into the glaze vertically. His basic mix starts with a 90,000 gram
glaze batch. For every 10,000 grams of dry glaze add 1/2 cup of muriatic
acid. Mix the glaze wet and slowly add the acid as you are stirring.
DO NOT DUMP THE ACID IN THE GLAZE!! If you do there can be acid
spitting at you. Take several tiles and dip them in the glaze. The
glaze will look too thick on the tile. Wait until it dries and scratch
through the glaze. You will see that the glaze is thinner on the pot
than you expect. I pour this mix on the inside of my platters and let
the glaze dry to the touch. I then put the platter on a gallon can
sitting on a rack the has a large stainless bowl under it. I pour the
center, pick up the platter and pour out the excess from the interior of
the platter. I then rest the platter on the can again so the lip hangs
out without touching the rack etc. I pour the plate from the outer foot
ring to the lip. There may be drips hanging from the lip, in most cases
I leave them and they melt in the firing. If you don't want those
drips, let the piece dry and you can use something to take them down in
thickness.
If you are doing pots and dipping them, double dipping them etc. you
will find the acid in the glaze works well. Be careful of the pure
acid!!!=3D20
This takes a little getting used too!=3D20
There are a couple of my platters and a pitcher that is dipped using
acid in the glaze. You can see them on Flickr: The lip drips I left on
the piece. The glaze has other glazes on top of the initial blue glaze.
=3D20
http://www.flickr.com/photos/25594880@N04/
Bill Merrill
=3D20
-----Original Message-----
From: Clayart [mailto:Clayart@LSV.CERAMICS.ORG] On Behalf Of KATHI
LESUEUR
Sent: Monday, May 04, 2009 12:56 PM
To: Clayart@LSV.CERAMICS.ORG
Subject: glaze question
At a recent show I was chatting with another potter. As often happens
the conversation got around to glazes and glaze applications. He told
me he used muratic acid in his glazes to thicken them and to keep
from having drips on edges when dipped. About one teaspoon to a five
gallon bucket. Before I go out and buy some muratic acid I thought
I'd see if anyone else has used this in their glazes and how well did
it work. Problems it created?
Thanks all,
KATHI LESUEUR
http://www.lesueurclaywork.com
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