T. Howard on sun 29 oct 00
Hi!
Reply to Ron Roy re: use of Barnard Clay. It is being used in two ways-in a
water solution, brushed on bisqueware and wiped off to enhance texture; then
also used as a glaze-1/2 Frit 3134,1/2 Barnard Clay.
I've had no replies re: if opening the kiln too soon can flatten elements.
Is our guild the only one experiencing flattening of elements?
Query about Vee Gum (used to keep glaze in suspension)- do you make a water
solution first and then add to the glaze or can you just sprinkle the powder on?
Thanks for your help-much appreciated.
Lois Atherton on mon 30 oct 00
Hi,
What cone are you firing the Barnard clay glaze to?
Nina Jones on mon 30 oct 00
You have to dissolve the Vee Gum in water before you add it to a glaze. =
Put in water, let stand overnight, then stir, -or- add to hot water, =
blend like crazy (in a blender or with a Jiffy Mixer) and let it stand for =
a few minutes (that's what I do with CMC (another gum), and it works for =
me). It forms little gummy balls if you try to add it directly to the =
glaze, even worse than bentonite.
Nina D. Jones
Southside Chicago
@ njones@winston.com=20
Mert & Holly Kilpatrick on mon 30 oct 00
I have found that Vee Gum can be dry mixed if you mix it around and disperse
it in the dry mix before adding the water, so that it isn't all in one
clump. That works for people who add the water to the dry powders.
Holly
----- Original Message -----
From: Nina Jones
To:
Sent: Monday, October 30, 2000 4:05 PM
Subject: Re: Vee Gum and Barnard Clay
You have to dissolve the Vee Gum in water before you add it to a glaze. Put
in water, let stand overnight, then stir, -or- add to hot water, blend like
crazy (in a blender or with a Jiffy Mixer) and let it stand for a few
minutes (that's what I do with CMC (another gum), and it works for me). It
forms little gummy balls if you try to add it directly to the glaze, even
worse than bentonite.
Nina D. Jones
Southside Chicago
@ njones@winston.com
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Ron Roy on wed 1 nov 00
Just so you understand - there is manganese in the Barnard Clay - so do the
right thing to eliminate the dust. Under no circumstances should the
brushed on Barnard be dry before wiping off - always wet to eliminate
dusting.
The glaze kiln must be vented properly to eliminate the Manganese fumes
from any areas where people are breathing - you can include animals in that
as well if you like. The fumes will condense on all surfaces and then can
be respirated as as dust.
Just so you know what you are dealing with.
I think I might be able to reformulate that glaze without the Manganese -
it will not be as dark but perhaps an addition of cobalt will make it look
the same.
Well I just did it - this is very close to your glaze but without the
manganese - you should try it with red iron and with black. If it needs to
be darker let me know.
The glaze. - it does not look like a durable glaze - too little alumina by
the way
Frit 3134 - 54.0
Red Art - 24.0
Iron oxide - 9.0
OM #4 - 5.5 (any ball clay will do)
Silica - 7.5
The slip clay for painting on bisque - just leave the frit out.
RR
>Reply to Ron Roy re: use of Barnard Clay. It is being used in two ways-in a
>water solution, brushed on bisqueware and wiped off to enhance texture; then
>also used as a glaze-1/2 Frit 3134,1/2 Barnard Clay.
>I've had no replies re: if opening the kiln too soon can flatten elements.
>Is our guild the only one experiencing flattening of elements?
>Query about Vee Gum (used to keep glaze in suspension)- do you make a water
>solution first and then add to the glaze or can you just sprinkle the
>powder on?
>Thanks for your help-much appreciated.
>
>______________________________________________________________________________
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
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