sheila alderman on wed 10 nov 99
I hope I am in contact with the right persons.
I have a glaze recipe that calls for K200 Feldspar. Val Cushing's Karen's
Sunshine Aqua. I have been told not to substitute. I cannot find K200.
Any suggestions about where to find it or what I can use?
Thanks
Sheila B Alderman
sbalderman@hotmail.com
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Tom Buck on thu 11 nov 99
Sheila A:
K200 feldspar has not been mentioned for sometime -- one concludes
therefore that it is no longer mined. This high potassium oxide spar has
a close cousin in Custer fs:
Oxide K200 Custer
CaO 0.04 moles 0.03 moles
K2O 0.60 0.67
Na2O 0.34 0.30
Al2O3 1.00 1.05
SiO2 6.12 7.17
If your recipe includes Silica/Flint/Quartz, then all one needs to do is
use less silica (via calculation) and substitute Custer fs in place of
K200 fs. If the recipe has no Flint, then a full glaze calculation will be
needed to make the adjustment. I, and many others, could do the
calculation for you.
Good tests. Peace. Tom B.
Tom Buck ) tel: 905-389-2339
(westend Lake Ontario, province of Ontario, Canada).
mailing address: 373 East 43rd Street,
Hamilton ON L8T 3E1 Canada
On Wed, 10 Nov 1999, sheila alderman wrote:
> ----------------------------Original message----------------------------
> I hope I am in contact with the right persons.
>
> I have a glaze recipe that calls for K200 Feldspar. Val Cushing's Karen's
> Sunshine Aqua. I have been told not to substitute. I cannot find K200.
> Any suggestions about where to find it or what I can use?
> Thanks
> Sheila B Alderman
> sbalderman@hotmail.com
>
> ______________________________________________________
> Get Your Private, Free Email at http://www.hotmail.com
>
John Britt on fri 12 nov 99
Shelia,
We have used the Karen's Starshine many time substituting any potash
feldspar, G-200 or Custer.
Looks great.
--
Thanks,
John Britt claydude@unicomp.net
Dys-Functional Pottery
Dallas, Texas
http://www.dysfunctionalpottery.com/claydude
http://www.silverhawk.com/ex99/britt/welcome.html
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