Bill Edwards on mon 30 jun 03
I would like to ask one quick question. Which Soda
spars do most of you use? Why? Any particular problems
or advantages over another that leads you to a certain
one?
This is my homework for the next month and I will
un-veil some things regarding this down the NOT SO
DISTANT road/future. Ron can you give me some
information as to which spar you would use to effect a
copper/tin turquoise ^6 Ox of course.
Theres little need in me supplying a recipe of sorts
right now. I am just highly curious as to favored soda
spars and looking for comparisons from various sources
and their reasons of use. Sourcing is important to me
and I find that for whatever unknown reason many of us
will be using certain materials as a whole more so
than others. Like G-200 potash spar which I stock
plenty of.
William Edwards
=====
http://www.tallapoosariverpottery.com/
Bill Edwards
PO Box 267
Lafayette, AL, 36862
__________________________________
Do you Yahoo!?
SBC Yahoo! DSL - Now only $29.95 per month!
http://sbc.yahoo.com
Roger Korn on tue 1 jul 03
Craig Martell wrote:
> Bill asked:
>
>> Which Sodaspars do most of you use? Why?
>
>
> Hello Bill:
>
> I've used Unispar 50 from Unimin Specialty Minerals in North
> Carolina. I've developed some glazes I like that originally had Kona
> F-4. I had trouble getting Kona so I tried fusion button comparisons of
> Kona and Unispar 50 at cone 10R. Almost identical melts, clarity, and
> frequency of craze lines. So I plugged Unispar 50 into my glazes on a
> 1 to
> 1 substitution and the results were perfect. No detectable
> differences. I
> do fusion buttons every time I buy a new load of any spar and the Unispar
> 50 has been 100% consistent.
Great idea! I accumulate native spars from around my AZ place and I'm to
the point
of starting to test them. The idea of observing crazing rates on fusion
buttons on
the same clay test tiles sure sounds cheaper than trying to get
dilatometry done.
The Ron/John book has got me thinking I need to pay more attention to fit.
Thanks,
Roger
>
>
> regards, Craig Martell Hopewell, Oregon
>
> ______________________________________________________________________________
>
> 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.
>
Craig Martell on tue 1 jul 03
Bill asked:
> Which Sodaspars do most of you use? Why?
Hello Bill:
I've used Unispar 50 from Unimin Specialty Minerals in North
Carolina. I've developed some glazes I like that originally had Kona
F-4. I had trouble getting Kona so I tried fusion button comparisons of
Kona and Unispar 50 at cone 10R. Almost identical melts, clarity, and
frequency of craze lines. So I plugged Unispar 50 into my glazes on a 1 to
1 substitution and the results were perfect. No detectable differences. I
do fusion buttons every time I buy a new load of any spar and the Unispar
50 has been 100% consistent.
regards, Craig Martell Hopewell, Oregon
Ron Roy on fri 4 jul 03
Hi William,
I just did a search on the web - Zemex lists the analysis of their products
- G200, NC4 - 200 (a soda spar) and EPK to list a few.
The NC4 - 200 is very close to Kona F4 and to C6 Spar although the Unimin
site does not list analysis - I am going by old analysis that I got from
Hamille and Gillespie - Web: http://www.hamgil.com
Min spar 200 is close as well but less KNaO.
The soda spars have less KNaO than the potash spars but have more CaO.
If it's soda you want may I suggest at least some Neph Sy - it's got more.
I use F4 because it's easy for me to get but I would not be averse to
putting in some Neph Sy. If you use a boron frit with no Al2O3 you will be
able to float it OK with ball and bentonite I think.
I would recommend trying at least one set with G200 - alkaline is alkaline
- and you get more with the G200 and Neph Sy.
RR
>I would like to ask one quick question. Which Soda
>spars do most of you use? Why? Any particular problems
>or advantages over another that leads you to a certain
>one?
>This is my homework for the next month and I will
>un-veil some things regarding this down the NOT SO
>DISTANT road/future. Ron can you give me some
>information as to which spar you would use to effect a
>copper/tin turquoise ^6 Ox of course.
>Theres little need in me supplying a recipe of sorts
>right now. I am just highly curious as to favored soda
>spars and looking for comparisons from various sources
>and their reasons of use. Sourcing is important to me
>and I find that for whatever unknown reason many of us
>will be using certain materials as a whole more so
>than others. Like G-200 potash spar which I stock
>plenty of.
>
>William Edwards
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
| |
|
