SCOTT YEIP on mon 5 apr 04
Hello, all,
Sorry, I have a headache, just dealing with incompetence while switching =
to new dsl service.
Okay, all of you glaze gurus, I am no chemist and I need help, as I said =
my head aches and I have been madly searching for info on the net.
I have an OOP Herb Sanders book, Glazes for Special Effects, with a =
couple of glazes I want to try.
Oil spots are calling for lepidolite (I just found and purchased the =
remaining 16lbs that Clay People had, hope it lasts the rest of my =
potting life). Someone mentioned that a substitute is Litholite., which =
I found from a pond supply (reliability of chem makeup, yeah right) =
Hamer lists Lepidolite as lithium feldspathoid, lithium mica, =
lithium-potassium mica, I have also seen it listed as lithium =
aluminosilicate. Clay people are offering lithium floride (pricey) and =
Mica P80K, (no I haven't looked up the chem. comp., headaches) Heaven =
forbid I should ever use up the sixteen pounds I just found, but for the =
sake of having this knowledge stored in my head for future references . =
.=20
My questions - 1. Is the only litholite source I found, (pond folk) not =
worth seeking out?
2. Does anyone know where I can find litholite =
(#400) or lepidolite (powder form) from a reputable source?
3. Will the other offerings from Clay people =
substitute? Read somewhere in my search on Lepidolite that its floride =
content is one
component that causes the bubbles that form oil =
spots, thus could one use the Lithium floride ?
4. Is there another material used at present in =
the formulation of oil spot glazes that I am not aware of?
5. Or as Sean Connery says, should I not get my =
knickers in a twist?
Thanks for you guidance and patience,
Amy
Hank Murrow on mon 5 apr 04
On Apr 5, 2004, at 10:20 AM, SCOTT YEIP wrote: . .
>
> My questions - 1. Is the only litholite source I found, (pond folk)
> not worth seeking out?
Depends. Litholite was a manufacrured material brought out by the Foote
Co. when the Lepidolite supply was compromised by African/Ameriacn
politics.
> 2. Does anyone know where I can find litholite
> (#400) or lepidolite (powder form) from a reputable source?
As far as I know, these are available only from old and not repeatable
stocks.
> 3. Will the other offerings from Clay people
> substitute? Read somewhere in my search on Lepidolite that its
> floride content is one
> component that causes the bubbles that form
> oil spots, thus could one use the Lithium floride ?
> 4. Is there another material used at present in
> the formulation of oil spot glazes that I am not aware of?
If you fire the glaze in oxidation up to cone 9 or 10, the iron will
reduce itself and create the blisters in the molten glaze. Not a
whisper of reduction until after the blisters form either on pieces you
can see in the spy, or on draw trials you pull from the kiln.
> 5. Or as Sean Connery says, should I not get my
> knickers in a twist?
Add Fluorine if you must from fluorospar or cryolite.
Cheers, Hank in Eugene
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