John Rodgers on wed 29 mar 06
Well, ummm, go a head an poke fun....... and all because my spell
checker can't spell. :-)
John R.
John Hesselberth wrote:
> On Mar 29, 2006, at 1:07 PM, John Rodgers wrote:
>
>> deocculation
>
>
> Uhhh, John. Is this where you scoop out an eyeball????? Just wondering.
>
> Sorry. Couldn't resist.
>
> Regards,
>
> John
>
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Carole Fox on wed 29 mar 06
I do not do slip casting, so please forgive my ignorance. I have some
plaster molds that I made to use as press molds and I was wondering if I
could just pour a thick slip on them. Can you use plain slip (or paperclay
slip) or must you add a deflocculant?
Carole Fox
Silver Fox Pottery
Elkton, MD
silverfoxpottery@comcast.net
earlk on wed 29 mar 06
On Wed, 2006-03-29 at 07:45 -0500, Carole Fox wrote:
> I have some
> plaster molds that I made to use as press molds and I was wondering if
> I
> could just pour a thick slip on them.
Carole,
I once made up a porcelain slip, loaded it into
a mustard squeeze bottle and squirted it out
into a concave press mold in sort of a basket
weave pattern. Other than for a couple of cracks
that developed in the clay as it dried it came
out quite well.
This may not be what you had in mind but your
question reminded me of this and I thought I'd
pass it on.
earlk...
bothell, wa, usa
John Rodgers on wed 29 mar 06
Carole, it can be done without deocculation, but it will take forever to
reach a point that allows you to handle the pieces. The defloculation
spreads the particles of clay apart enabling the water to more easily
migrate to the plaster, or surface of the cast piece, thus allowing
faster drying..
John Rodgers
Chelsea, AL
Carole Fox wrote:
> I do not do slip casting, so please forgive my ignorance. I have some
> plaster molds that I made to use as press molds and I was wondering if I
> could just pour a thick slip on them. Can you use plain slip (or
> paperclay
> slip) or must you add a deflocculant?
> Carole Fox
> Silver Fox Pottery
> Elkton, MD
> silverfoxpottery@comcast.net
>
> ______________________________________________________________________________
>
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
> melpots@pclink.com.
>
>
John Hesselberth on wed 29 mar 06
On Mar 29, 2006, at 1:07 PM, John Rodgers wrote:
> deocculation
Uhhh, John. Is this where you scoop out an eyeball????? Just wondering.
Sorry. Couldn't resist.
Regards,
John
Snail Scott on fri 31 mar 06
At 07:45 AM 3/29/2006 -0500, Carole F wrote:
>I do not do slip casting, so please forgive my ignorance. I have some
>plaster molds that I made to use as press molds and I was wondering if I
>could just pour a thick slip on them. Can you use plain slip (or paperclay
>slip) or must you add a deflocculant?
The reason casting slip has deflocculants is
so that adequate fluidity can be attained with
less water. Less water = less shrinkage.
You could use plain slip, but it would shrink
a great deal, and warp more also as it may
tend to dry irregularly. How much this matters
will depend on your form and intentions.
-Snail
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