Hank Murrow on wed 29 mar 06
On Mar 29, 2006, at 4:32 PM, Ken Fischer wrote:
> I got the recipe for Reitz Green from John Britt's book but have had
> persistant problems with pinholing. Bisque is fired to ^08.
> The glaze is on white stoneware fired to ^10 in reduction. Any
> suggestions?
Ken:
Try bisquing to 06. That white stoneware may have some combustibles
that need more temperature(or more time) to burn out.
Cheers, Hank
>
www.murrow.biz/hank
Ken Fischer on wed 29 mar 06
I got the recipe for Reitz Green from John Britt's book but have had
persistant problems with pinholing. Bisque is fired to ^08. The recipe
is as follows:
Neph. Sy. 70%
petalite 15
Whiting 5
Ball clay 8
Gerstly B. 2
Rutile 2
CoCO3 1
The glaze is on white stoneware fired to ^10 in reduction. Any
suggestions?
Gail Dapogny on thu 30 mar 06
Ken,
Try firing your bisque to 06, and don't fire it too fast (100 f per
hour between 1300 and 1700 f. ). You may have some impurities that
aren't getting enough chance to burn out, so this might help your
problem.
Regards
Gail Dapogny in Ann Arbor, Michigan
On Mar 29, 2006, at 7:32 PM, Ken Fischer wrote:
> I got the recipe for Reitz Green from John Britt's book but have had
> persistant problems with pinholing. Bisque is fired to ^08. The
> recipe
> is as follows:
> Neph. Sy. 70%
> petalite 15
> Whiting 5
> Ball clay 8
> Gerstly B. 2
>
> Rutile 2
> CoCO3 1
>
> The glaze is on white stoneware fired to ^10 in reduction. Any
> suggestions?
>
> ______________________________________________________________________
> ________
>
Ivor and Olive Lewis on thu 30 mar 06
Dear Ken Fischer,
If possible read the analyses of each of your ingredients. Look in each =
for Oxides of iron. In total you may have less than one percent of Fe2O3 =
in the composition of your glaze from various sources, and this should =
include your colouring agents, but it is enough when firing at cone ten =
to release oxygen into the melt.
You can test this by firing a sample that has no colouring agents in it.
So. if I am correct you will need to eliminate that Rutile.
Best regards,
Ivor Lewis.
Redhill,
South Australia.
James and Sherron Bowen on sun 2 apr 06
This may not be useful to you but Reitz Green looks awfully like a Shino and
I always expect Shino's to pinhole. I don't know why they do. I suspect
they are pretty stiff glazes and just don't heal over like more fluid glazes
will.
=============================================================
Ron Roy on sun 2 apr 06
Hi Ken,
The advice to bisque slower - make sure you are in oxidation and bisque
higher (i recommend 04) is good advice if any iron(specks) in body.
If you refire and they get worse then a cleaner bisque is called for.
If refiring cures the problem the glaze and/or the firing needs to be adjusted.
RR
>I got the recipe for Reitz Green from John Britt's book but have had
>persistant problems with pinholing. Bisque is fired to ^08. The recipe
>is as follows:
>Neph. Sy. 70%
>petalite 15
>Whiting 5
>Ball clay 8
>Gerstly B. 2
>
>Rutile 2
>CoCO3 1
>
>The glaze is on white stoneware fired to ^10 in reduction. Any
>suggestions?
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Hank Murrow on mon 3 apr 06
On Apr 1, 2006, at 11:02 PM, James and Sherron Bowen wrote:
> This may not be useful to you but Reitz Green looks awfully like a
> Shino and
> I always expect Shino's to pinhole. I don't know why they do. I
> suspect
> they are pretty stiff glazes and just don't heal over like more fluid
> glazes
> will.
Dear folks;
I use Reitz Green without experiencing any pinholes. I fire it in
oxidation in a gas kiln to cone 10+. It originally was a shino until
Pete Pinnell or someone tried it with cobalt and rutile. It is not that
stiff for a shino........ my own are far stiffer.
Bisque high or long to burn off any sulphur or?? in the clay and glaze
without worry.
Cheers, Hank
www.murrow.biz/hank
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