Gail Dapogny on fri 2 aug 02
The other day I mentioned a problem that I urgently want to do something
about. In a nutshell: I'm fooling around with a cone 04 firing of some
non-functional earthenware and wonder about slightly sealing the stains I
want to use on areas of the clay body. I want to defeat that dusty look
that unsealed stains can get, but don't want anything more than a very
slight sheen.
Should I spray lightly with a frit or a gerstley borate/water solution (or
anything else) to accomplish this? I don't want to end up with a milky
look or anything that would interfere with either the stains or the terra
cotta clay color.
I sure would appreciate advice on this subject. Thanks very much.
---Gail
Gail Dapogny
1154 Olden Road
Ann Arbor, MI 48103-3005
(734) 665-9816
gdapogny@umich.edu
http://www.silverhawk.com/ex99/dapogny (single historical photo - no longer
registered with Silverhawk)
Stephani Stephenson on fri 2 aug 02
Gail You could try a couple of different methods.
either:
1) spray light coating of gerstley borate, or a frit such as ferro
frit 3134, 3195 or 3124 on surface of the pot,
then apply stain (or apply stain first, then spray with flux) a LIGHT
coating is key here...you will need to experiment to find out the right
amount
OR
2) mix Gerstley or frit in with stain, add liquid and apply to pot.
I would suggest doing a rough line blend of stain to frit in
proportions of 80:20, 60:40, (50:50), 40:60. and 20:80
to see which ratio gives you just enough fluxing power to get rid of the
'dusty look' and adhere stain to clay, but not so much flux that you
have a glossy coat.
3195 by itself is a clear gloss at cone 04, but is a very unobtrusive
clear and a good base for colors
3134, a boron frit, is a pearly gloss at this temp, with opalescent
qualities
frit 3124 is similar to 3134 except it has some opacity...tends to
white, is used often in majolica formulas
if you use frit you will likely need to also add some bentonite or clay
to the mixture to help keep the frit in suspension...it sinks easily to
the bottom of the jar or spray container.
Gerstley stays in suspension better .
also , if you don't want to mess with frits, you can spray or use
thinned down commercial glaze... try a clear satin or matte....
In the long run you will likely feel better about this solution than
using sealant.
yet it is a fine line...seems like they go from 'dusty' to 'too shiny'
REAL fast...sometimes hard to capture that middle ground!
best wishes
Stephani Stephenson
Carlsbad CA
Tommy Humphries on fri 2 aug 02
Use any of the low temperature boron frits. Mix them with the stains and
they will flux the stains onto the clay giving a good sheen. You might need
to experiment a bit to get the amount of shine you want, but it shouldn't
take much to do the job, since these frits can be used almost by themselves
as Raku glazes.
Tommy
----- Original Message -----
From: "Gail Dapogny"
To:
Sent: Thursday, August 01, 2002 11:00 PM
Subject: HELP needed: cone 04
> The other day I mentioned a problem that I urgently want to do something
> about. In a nutshell: I'm fooling around with a cone 04 firing of some
> non-functional earthenware and wonder about slightly sealing the stains I
> want to use on areas of the clay body. I want to defeat that dusty look
> that unsealed stains can get, but don't want anything more than a very
> slight sheen.
>
> Should I spray lightly with a frit or a gerstley borate/water solution
(or
> anything else) to accomplish this? I don't want to end up with a milky
> look or anything that would interfere with either the stains or the terra
> cotta clay color.
>
> I sure would appreciate advice on this subject. Thanks very much.
>
> ---Gail
>
> Gail Dapogny
> 1154 Olden Road
> Ann Arbor, MI 48103-3005
> (734) 665-9816
> gdapogny@umich.edu
> http://www.silverhawk.com/ex99/dapogny (single historical photo - no
longer
> registered with Silverhawk)
>
>
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>
Stephani Stephenson on sat 3 aug 02
Another option is to add dry cone 06 white casting slip to stain..
start with 50/50 ratio or do a line blend of stain to casting slip to
see which is the best ratio for you .
add water so that you have a thin mixture, like skim milk.
the casting slip has very nice properties with regard to suspension in
water, shrinkage, bonding to clay surface, allowing color of stain to
show through, and surface durability.
this works at higher temps too. or use a cone 6 white casting slip
This is a tip I got from Rudy Autio.
Stephani Stephenson
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