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making underglazes

updated fri 22 oct 99

 

coorey on mon 18 oct 99

Is there any one who knows about making underglazes??
Or know anywere on the net??

gelindo ferrin on tue 19 oct 99

I have a good recipe for making engobes if you would
like to try it :
equal parts:Feldspar potash,silica
,ballclay,kaolin.Then add appropriate percentages of
your colorant.;You can use this engobe for any
application,any type clay,but the colorsseem brighter
in hifire.Also ,be sure to mix when dry,and if it sits
around any length of time,mix again b/4you add
colorant and water.














--- coorey wrote:
> ----------------------------Original
> message----------------------------
> Is there any one who knows about making
> underglazes??
> Or know anywere on the net??
>


=====

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Gregory D Lamont on tue 19 oct 99

At 05:47 PM 10/18/99 -0400, you wrote:
>----------------------------Original message----------------------------
>Is there any one who knows about making underglazes??
>Or know anywere on the net??

I've had generally good results using a formula of 1/3 kaolin (I use EPK),
1/3 frit 3124 and 1/3 ceramic stain. This is mixed with liquid laundry
starch (I use Sta-Flo brand) to a thin yogurt consistency. Further
thinning is done with water, as necessary. Overglazing is done with a cone
04 clear glaze.
Greg

- Laura Moon on tue 19 oct 99

I have been using a white slip base and adding mason stains at 15%. Some
stains produce really good colors some not so good. I am still at the
testing phase, I seem to have a better fit if I apply the underglazes on
leatherhard ware with 2-3 coats. I use the2-3 coats to get the coverage I
like. I have tried applying on bone dry and get some cracking when I apply
2-3 coats. I have not yet tried applying on bisque thought do not think this
will work well. I am using a red earthenware clay and firing to ^08, then
applying a clear glaze and firing to ^03 with good results.

Hope this helps. Let me know if you find some magic.

Laura Moon in sunny warm South Florida

Marvin Flowerman on thu 21 oct 99

Gelindo:

How do you recommend applying your engobe recipe: wet clay, bone dry,
bisque, covered by other glazes, viscosity?

Answers to these questions would be helpful.

Many thanks.

Marvin Flowerman
marvpots@aol.com

Marvin Klotz on thu 21 oct 99

At 05:47 PM 10/18/1999 -0400, you wrote:
>----------------------------Original message----------------------------
>Is there any one who knows about making underglazes??
>Or know anywere on the net??

If you check the Clayart archives
at<> under the underglaze
category you will find quite a few entries that might interest you. I have
tried, and liked, the recipe originally sent in by Harold R. Deeley which
is discussed in entries:024437 dated 97.10.27 and 045028 dated 98.11.30. I
have used underglazes made up according to this recipe at cone 6 with quite
a bit of success. I did have to search around for a clear overglaze that
didn't bleach out the crimsons and pinks and at the same time not craze on
the clay I use.