Chris Campbell on sat 12 oct 02
I have a dumb question for you Vince ...
I am currently using a slip made with a brilliant white porcelain. I
let the clay dry then re-mix it with water in a blender. I paint it over a
less white clay body so as to get a good white surface for my drawings.
It adheres very well with the only downside being it is somewhat
powdery until fired. I use this slip more or less because it is easy and it
works.
What would be the advantages to using a slip such as the one you give
the recipe for? What am I missing out on?
Thanks
Chris Campbell - in North Carolina
'Deep water and drowning are not the same thing' .....James Baldwin
Chris Campbell Pottery, LLC
9417 Koupela Drive
Raleigh NC 27615-2233
e-mail : ccpottery@aol.com
website : www.wholesalecrafts.com
vince pitelka on sat 12 oct 02
> I am currently using a slip made with a brilliant white porcelain.
I
> let the clay dry then re-mix it with water in a blender. I paint it over a
> less white clay body so as to get a good white surface for my drawings.
> It adheres very well with the only downside being it is somewhat
> powdery until fired. I use this slip more or less because it is easy and
it
> works.
> What would be the advantages to using a slip such as the one you
give
> the recipe for? What am I missing out on?
Nothing at all wrong with that question, Chris. It sounds like you are not
missing out on anything. You have a slip that works on your claybody, so
stick with it. My recipe is just a generic white slip recipe which works
well on most claybodies at most firing temperatures.
It is a characteristic problem with porcelain-based slips that they are
powdery on the surface. That is because porcelains contain a fairly coarse
range of particle sizes, leaving less contact points between particles,
giving a weaker matrix at the bone-dry and bisque-fired stages. If you are
bisque-firing your wares before glazing them, then you could certainly add a
little cmc liquid to your slip to give a harder dry coating. It would also
give smoother brushing consistency.
Best wishes -
- Vince
Vince Pitelka
Appalachian Center for Crafts
Tennessee Technological University
1560 Craft Center Drive, Smithville TN 37166
Home - vpitelka@dtccom.net
615/597-5376
Work - wpitelka@tntech.edu
615/597-6801 ext. 111, fax 615/597-6803
http://www.craftcenter.tntech.edu/
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