Peter and Samantha Tomich on mon 10 feb 03
This is a post from last year that particularly caught my attention as I
am very interested in making my own underglaze medium and plan to use stains
and colorants in them and I have silkscreened underglazes onto my work
before. Ivor you said you make this underglaze medium, could you clarify a
few points for me? Do you include clay in this mix? You don't list it as an
ingredient. I was thinking you had to use some of the clay body you were
using. Also, I don't know how much of each of the ingredients to put in. Can
you be more specific? What frit would you use firing to ^6? Next, what would
be the best media for a silkcreen ink base? BTW, Does anyone know a good
book or other reference on making decals, etc, So I can figure out the best
paper and all of that before I make a general mess of things? I have the
Paul Scott Book. I have no desire to reinvent the wheel here with the
techniques of printing. I am looking to incorporate my itaglio work/collage
etc with my digital photography and silkscreen that onto my work with
abstract expressionistic imagery incorporated into the design on the pieces.
This on dinnerware. I'm excited. We'll see.
Samantha Tomich
"Multimedia artist and ceramic futzer... okay, okay, potter already!"
Waikoloa, Hawaii
peter.sam@verizon.net
HYPERLINK "http://s_a_m.tripod.com/pottery.html"
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snip... "underglaze medium"... snip.....
Suppliers never let us know what is in these liquids. But it needs some
basic things in it.
1 Something to make it stick to the bisque, green pot or leather hard pot.
2 Something which will flux the stain and the pot to give adhesion during
the first firing.
3 Something which will make it flow well from the brush.
4 Some fluid to act as a vehicle.
The solution, in reverse order might be Water, Glycerine, A low temp frit
for low and middle fired work or a High temp frit, soda felspar or Neph Sye
for stoneware or porcelain and a gum adhesive such as CMC, Gum Tag or Gum
Acacia.
I make my own. Mix it up, grind in the colours with a spatula on a white
tile with a small amount of liquid and adjust to get the flow. then paint or
stamp away. The more filler the paler the colours. Keep this to a minimum to
prevent getting resist spots which break the flow of the glaze, you only
need enough to sinter the colour to the pot.
Some times it may be necessary to use a non aqueous medium. This enlarges
the choice of decorative techniques which can be used with underglaze
stains. Choose from: alcoholic shellac; light spirit and wax: oil and a
drying varnish. Some of these are useful as printing inks. But that is
another story.
Best regards,
Ivor Lewis. Redhill, South Australia.
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iandol on tue 11 feb 03
Dear Samantha Tomich,
Without getting into the archives I cannot recall the precise details so =
I will answer as a general case. I'm sure with all the knowledge you =
will be of and running with a lot of test tiles.
Using Masons and Walkers Stains (Not a commercial!!!)I add a small =
quantity of the clay body I am using (which is white stoneware or =
Porcelain) for the purpose of creating adhesion by sintering. I do not =
wish to get fusion because this would reduce the ability of the =
underglaze overlay to suck glaze in such a way that there is a =
consistent thickness over the whole pot. If you use a Frit flux (Mp's =
seem to be round the 800=B0C Mark)to do this you will seal the surface =
and reject the glaze when it is applied. Since I do not work at Cone 6 I =
would not know what to suggest. However, if you know your clay well and =
you do not wish to dilute the intensity of the underglaze stain by =
adding excess clay, or change the colour because your clay is dark, then =
use a very small percentage of the flux which is in the clay. Stepping =
out on a limb, just add a dash of Nepheline Syenite, about 2-5% of the =
stain weight. Mason do make Dilutant fillers for their colours.=20
I have not done any screen printing for over a decade but I still like =
the idea of Glycerine and Water with Gum Arabic or Trag as the adhesive. =
But if you are using the paper transfer method of getting the image onto =
clay by Off Set Printing, leave out the Gum adhesive.
Someone else will have to come forward about Decals.
Best regards,
Ivor.
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