PeteTree@AOL.COM on thu 20 jun 02
I'm a little new at this, but here goes. I have 500 lbs of porcelain and i would like to make some simple engobes (sp?) that i can use to decorate.
The porcelain fires at cone 10 and is made from the following recipe
China Clay 25%
OM4 Ball Clay 25%
Silica 25%
Custer Feldspar 25%
Is anyone has any suggestions, please let me know.
thanks,
peter
Julie Milazzo on thu 20 jun 02
Hey Pete,
I'm kind of curious about this one, myself. I was
thinking about buying some mason stains, and then just
mixing them with slip of the same porcelain body, but
I'm not too sure about them sticking to bisqueware. In
fact, I'm sure they wouldn't. Hmmm... I have some
recipes for engobes and flashing slips that I got from
a Biz Littel workshop. We used them in a salt firing,
and I haven't tried them out in my gas kiln, yet. We
didn't use porcelain, but maybe the recipes would be a
good starting point, anyway. Are you looking for earth
tones, or more bright stuff? I'm assuming that since
it's high fire, you want more earthier colors (which
my recipes are), but I also got to see part of a Ro
Mead workshop, where she makes pieces out of colored
porcelain (you would not believe the colors) using
mason stains. They are bright, vibrant, and, I think,
cone ten. Let me know if you are interested in the
recipes! Jules
PMS. If you get any great ideas, would you please
forward them on to me? I'd be very interested in some
interesting effects, as the only glaze color that
seems to look good on my pots is "clear"...
--- PeteTree@AOL.COM wrote:
> I'm a little new at this, but here goes. I have
> 500 lbs of porcelain and i would like to make some
> simple engobes (sp?) that i can use to decorate.
> The porcelain fires at cone 10 and is made from
> the following recipe
>
> China Clay 25%
> OM4 Ball Clay 25%
> Silica 25%
> Custer Feldspar 25%
>
> Is anyone has any suggestions, please let me know.
>
> thanks,
> peter
>
>
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David Hendley on thu 20 jun 02
Dear Peter, there are 2 basic goals you need to meet to make
successful engobes:
1 - The engobe must stick to the clay without cracking or flaking
off. If you want to put the engobe on wet clay, the best match
will be to make a slip out of the same recipe as the clay.
With dark clays this can be a problem, because the clay will
dull-down the color of the engobe.
With porcelain, you are in business.
If you want to apply the engobe at a different time, such as on
dry clay or on bisque-fired clay, you will need to adjust the
recipe to get a good fit.
2 - You need to develop the color you want. This pretty straight
forward. There are charts in all good books on the subject that
tell you exactly how much of each colorant to use, to start your testing.
You can also use commercial stains, and the color charts from the
stain companies will give you a starting point. Generally, you
need more colorant in a slip than a glaze to give the same
intensity of color.
Once you have the basics worked out, you can try changing
things. For instance, if you want a more fluxed (melted) slip,
try replacing 5% of the silica and feldspar with 10% whiting,
or try adding 5% borax or soda ash to the basic recipe.
You do want to keep the ratio of plastics (clay) and non-plastics
(everything else) at about the same proportion.
Your 25-25-25-25 recipe is the most common and most used
porcelain recipe around. It is a tried-and-true place to start.
David Hendley
Maydelle, Texas
hendley@tyler.net
http://www.farmpots.com
> > I'm a little new at this, but here goes. I have
> > 500 lbs of porcelain and i would like to make some
> > simple engobes (sp?) that i can use to decorate.
> > The porcelain fires at cone 10 and is made from
> > the following recipe
> >
> > China Clay 25%
> > OM4 Ball Clay 25%
> > Silica 25%
> > Custer Feldspar 25%
> >
> > Is anyone has any suggestions, please let me know.
> >
> > thanks,
> > peter
> >
Ron Roy on sun 23 jun 02
Hi Peter,
I would use the same recipe as the porcelain - if - when adding colouring
oxides you get too much melting reduce the spar a bit.
If the engobe cracks when applied on the thick side you may have to deflocc it.
This way you will not have to worry about a misfit between the body and the
slip.
RR
> I'm a little new at this, but here goes. I have 500 lbs of porcelain
>and i would like to make some simple engobes (sp?) that i can use to
>decorate.
> The porcelain fires at cone 10 and is made from the following recipe
>
>China Clay 25%
>OM4 Ball Clay 25%
>Silica 25%
>Custer Feldspar 25%
>
>Is anyone has any suggestions, please let me know.
>
>thanks,
>peter
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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