BBarus on wed 17 oct 01
A newbie here - I am making some porcelain tessarae for a mosaic project
and I want to stain the porcelain clay throughout - not just glaze the
top. I have my clay, and many bags of Cerdec and Mason stains. Now ... I
need to know how to get the color into the clay. Mask, gloves, wedging
board, kiln are all ready. I have done porcelain and china painting and
sculpting for years but have never tried this before. TIA for all advice. Barb
David Hewitt on thu 18 oct 01
I make coloured porcelain by taking a 1kg of clay and the appropriate
weighed amount of colouring oxide or stain. Put the oxide or stain into
a small dish and add a little water to make a thin paste. Hollow out
the 1kg of clay and pour in the oxide or stain and wedge until a uniform
colour has been achieved.
For blue I add 6g of cobalt oxide per 1kg of porcelain
For pink I add 70g of Blythe Strong Red per 1kg of porcelain
For green I add 10kg of Chrome oxide per 1kg of porcelain
For brown I add 50g of Tan Brown per 1kg of porcelain
The above and further details can be seen on my web site under 'How I
make Agateware.
http://www.dhpot.demon.co.uk
David
In message , BBarus writes
>A newbie here - I am making some porcelain tessarae for a mosaic project
>and I want to stain the porcelain clay throughout - not just glaze the
>top. I have my clay, and many bags of Cerdec and Mason stains. Now ... =
>I
>need to know how to get the color into the clay. Mask, gloves, wedging
>board, kiln are all ready. I have done porcelain and china painting and
>sculpting for years but have never tried this before. TIA for all advice=
>. Barb
--
David Hewitt
David Hewitt Pottery ,
7 Fairfield Road, Caerleon, Newport,
South Wales, NP18 3DQ, UK. Tel:- +44 (0) 1633 420647
FAX:- +44 (0) 870 1617274
Web site http://www.dhpot.demon.co.uk
Timakia@AOL.COM on thu 18 oct 01
Hi Barb, you can go the long way and mix your stain with water and put that
through a sieve. Make a hole in your plastic clay. Pour the mixture in the
hole and simply start working it in with your fingers. Let the clay rest for
a day or so before use to give the tired clayparticles time to restore.
The other way, that I use , is to take the slurry that come off my wheel and
mix the powderd stains into that. Put it through a 80-100# sieve to get the
lumps out of the stains. Mix well before putting the mixture on a plasterbat
to dry out till plastic stage.
Antoinette.
Http://Hometown.aol.com/timakia
David Beumee on thu 18 oct 01
It may not be the answer that you wanted to hear, but the most thourough way
to get color into your porcelain is to add your stain to a slurry made of
your claybody. This means drying out your clay in chunks about the size of a
golfball or less. The trick is to make sure the clay is completely dry so it
will slake properly. Then weigh out the clay and add whatever percentages of
stain you have determined to be correct for the strength of color you want.
You must have a dry weight of clay so that a percentage addition of stain
means something for future reference. Then add your clay chuncks to water,
never the other way around, and wait a day for the clay to slake, and make
sure the water level stays above the level of clay. Ofcourse the smaller the
dry clay chunks, the faster the clay will slake down. Drill up the mixture,
and wait another day if necessary for larger chunks to slake. Add water as
necessary to make a mixture thin enough so your drill mixer will move the
entire mass. You will be able to tell when you have a perfectly smooth
mixture. Now add your percentage of stain and mix thouroughly until you have
a smooth, even color throughout. I dry out recycled slurry in wooden frames,
which have hardware cloth attached to the bottom of the frame. Put some kind
of cotton material ( I use cotton ticking) , and line the bottom of the
frame, which needs to be up off the floor( a few bricks under each corner
will suffice), so that water can drain through the cotton, and pour your
colored slurry into the frame. Water will drain from the slurry through
the cotton fabric, and evaporate from the top of the mass. When sufficiently
dry, you have clay which is thouroughly colored for use in you mosaic.
----- Original Message -----
From: "BBarus"
To:
Sent: Wednesday, October 17, 2001 7:34 PM
Subject: Bofy Staining Porcelain Clay
> A newbie here - I am making some porcelain tessarae for a mosaic project
> and I want to stain the porcelain clay throughout - not just glaze the
> top. I have my clay, and many bags of Cerdec and Mason stains. Now ... I
> need to know how to get the color into the clay. Mask, gloves, wedging
> board, kiln are all ready. I have done porcelain and china painting and
> sculpting for years but have never tried this before. TIA for all advice.
Barb
>
>
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