Marianne Lombardo on fri 27 sep 02
I found this recipe for making underglaze pencils/crayons on Ceramics
Today's website. I have a question though. It calls for Sodium Silicate.
I don't see that in the Tucker's catalog, and the pharmacy does not carry
it. What does it do? Would it be to make it dry slower and if so would
Darvon 7 work instead? Or is it not needed at all?
50.0 Ball Clay
25.0 Potash Feldspar
25.0 Flint
5.0 Bentonite
15.0 Colorant (iron oxide, Copper Carb, Cobalt, etc.)
It says for every 100 g (4 ounces) of powder, mix in a teaspoon of sodium
silicate to the water.
Fire to 800C to 900C.
Marianne Lombardo
Omemee, Ontario, Canada
email: mlombardo@nexicom.net
Ron Collins on fri 27 sep 02
I just used equal parts ball clay, talc, and added colorants/oxides to
taste, and rolled my own....can sharpen with little pencil sharpener...they
work fine.....I fired to about 800 c. Melinda
Craig Clark on fri 27 sep 02
Marianne, I'm not sure about what the Sodium Silicate does in this case,
I have only used it as a high temperature adhesive, but I do know where you
are able to get it. It is much cheaper to buy it from a foundry supply store
than to buy it from a Ceramics supply outfit. Our local place is Able
Refractories. Check the yellow pages for the nearest large metropolitan area
to you and you will probably be able to find one. Look under refractories.
Baring that you might try either Axner or I know that our local ceramics
supply store, The Ceramics Store Inc., sells it. If you want the number of
our outlet give me a call or contact me off of the thread.
Craig Dunn Clark
619 East 11 1/2 st
Houston, Texas 77008
(713)861-2083
mudman@hal-pc.org
----- Original Message -----
From: "Marianne Lombardo"
To:
Sent: Friday, September 27, 2002 3:28 PM
Subject: Recipe for Underglaze Pencils
> I found this recipe for making underglaze pencils/crayons on Ceramics
> Today's website. I have a question though. It calls for Sodium Silicate.
> I don't see that in the Tucker's catalog, and the pharmacy does not carry
> it. What does it do? Would it be to make it dry slower and if so would
> Darvon 7 work instead? Or is it not needed at all?
>
> 50.0 Ball Clay
> 25.0 Potash Feldspar
> 25.0 Flint
> 5.0 Bentonite
> 15.0 Colorant (iron oxide, Copper Carb, Cobalt, etc.)
>
> It says for every 100 g (4 ounces) of powder, mix in a teaspoon of sodium
> silicate to the water.
>
> Fire to 800C to 900C.
>
> Marianne Lombardo
> Omemee, Ontario, Canada
> email: mlombardo@nexicom.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.
Pat Southwood on sat 28 sep 02
Marianne,
At last a recipe that I can recognise all of the ingredients in! ( English
ingredients) I hav'nt got a clue what Darvon 7 is - sounds like something
from startrek.
Sodium Silicate is a deflocculant, i.e it is an electrolyte added to the
clay so that fluidity can be achieved with a minimum amount of water.
Apparently sodium silicate comes in different potencies which are rather
delightfully measured in "degrees of twaddle".
Another deflocculant is soda ash.
Hope this is of some use
Hope this helps,
----- Original Message -----
From: "Marianne Lombardo"
To:
Sent: Friday, September 27, 2002 9:28 PM
Subject: Recipe for Underglaze Pencils
> I found this recipe for making underglaze pencils/crayons on Ceramics
> Today's website. I have a question though. It calls for Sodium Silicate.
> I don't see that in the Tucker's catalog, and the pharmacy does not carry
> it. What does it do? Would it be to make it dry slower and if so would
> Darvon 7 work instead? Or is it not needed at all?
>
> 50.0 Ball Clay
> 25.0 Potash Feldspar
> 25.0 Flint
> 5.0 Bentonite
> 15.0 Colorant (iron oxide, Copper Carb, Cobalt, etc.)
>
> It says for every 100 g (4 ounces) of powder, mix in a teaspoon of sodium
> silicate to the water.
>
> Fire to 800C to 900C.
>
> Marianne Lombardo
> Omemee, Ontario, Canada
> email: mlombardo@nexicom.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.
Snail Scott on mon 30 sep 02
At 04:28 PM 9/27/02 -0400, you wrote:
>I found this recipe for making underglaze pencils...calls for Sodium
Silicate.
>I don't see that in the Tucker's catalog...Would it be to make it dry
slower and if so would
>Darvon 7 work instead?
I'm guessing that in this case, the sodium silicate
is not intended as a deflocculant (or to affect the
drying rate), but to reduce the water needed to make
it pliable and for its other notable property - it
turns hard as a rock when it dries. So, I don't know
that Darvan would do it. But that's just a W.A.G. It
should be easy to find sodium silicate, though; I'm
surprised your regular supplier doesn't have it, but
try another - it's not rare.
-Snail
p.s.
Darvan is a deflocculant. Darvon is a prescription
narcotic. Both very useful, but not interchangeable!
;)
Catherine White on mon 30 sep 02
Is not Darvon a pain killer?
Catherine in Yuma, AZ
Sent: Saturday, September 28, 2002 2:44 AM
Subject: Re: Recipe for Underglaze Pencils
> Marianne,
> At last a recipe that I can recognise all of the ingredients in! ( English
> ingredients) I hav'nt got a clue what Darvon 7 is - sounds like something
> from startrek.
Marianne Lombardo on tue 1 oct 02
Whoops. I think I spelled it wrong. Should have been Darvan 7.
Marianne Lombardo
Omemee, Ontario, Canada
email: mlombardo@nexicom.net
> Is not Darvon a pain killer?
>
| |
|
