Ron Roy on sun 10 aug 97
Hi Veronica,
You can post these to the list but make sure all my instructions are included.
If you want to test them first thats even better - wish I had time to do it
myself.
The original.
>Floating Blue (cone 6 ox.)
>47.3 Neph Sy
>27 Gerstley Borate
>20.3 Flint
>5.4 EPK
>2 Red Iron Ox.
>1.2 Cobalt Ox.
>4 Rutile
Total 107.2
Ratio 6.85
Expansion 504.73
#1 and 3 follow - to get #2 mix 1+3. I suggest you do it that way because
#2 just might be a possiblity and cheaper than #3. I don't know if they are
going to melt more because of the frits so be careful. Always mix at least
200 grams for tests.
#1 (RRFB) with Frit 3134.
Neph Sy - 41.0
Gers borate - 17.0
Frit 3134 - 13.0
Silica - 18.0
EPK - 11.0
Red iron - 2.0
Cobalt ox. - 1.2
Rutil - 4.0
Total - 107.2
Ratio 6.79
Expansion 502.85
#2 is #1 + #3
#3 (RRFB) with Frit 3134.
Neph Sy - 30.0
Frit 3134 - 36.0
Silica - 14.0
EPK - 20.0
Red iron - 2.0
Cobalt ox. - 1.2
Rutil - 4.0
Total - 107.2
Ratio 6.82
Expansion 502.53
The above are higher than the original in CaO because frit 3134 brings more
than is needed so the next set will be an even more exact copy.
#4 (RRFB) with Frit 3278.
Neph Sy - 37.0
Gers borate - 18.0
Frit 3278 - 12.0
Whiting - 2.0
Talc - none
Silica - 18.0
EPK - 13.0
Red iron - 2.0
Cobalt ox. - 1.2
Rutil - 4.0
Total - 107.2
Ratio 6.79
Expansion 501.92
#5 is #4 + #6
#6 (RRFB) with Frit 3278.
G200 - 22.0 < note change to G200 or Custer
Frit 3278 - 36.0
Whiting - 4.0
Talc - 3.0
Silica - 8.0
EPK - 27.0
Red iron - 2.0
Cobalt ox. - 1.2
Rutil - 4.0
Total - 107.2
Ratio 6.84
Expansion 505.59
All are durable glazes as far as I can see - including the original.
To all who try any of these - let me know how they work. It is possible
they will craze on some bodies - especialy vitrified porcelains. I can fix
that in some cases.
Ron Roy - August 1997
Ron Roy
Toronto, Canada
Evenings, call 416 439 2621
Fax, 416 438 7849
Studio: 416-752-7862.
Email ronroy@astral.magic.ca
Home page http://digitalfire.com/education/people/ronroy.htm
The Shelfords on tue 12 aug 97
Thanks very much for the test possibilities, Ron. I will run them through
(at least the Frit 3134 ones for now - haven't got any 3278, will have to
order it and re-enter the outside world to pick it up sometime) and let you
all know what results. In due course. First - get over this #%!!*&##!
flu, which has prevented me from getting to Vince's workshop in WA and I am
seriously disgruntled. Then, build the shelves and work surfaces in the
glazing area of my new temporary studio space, so that the glaze materials
can come out of storage. Then TO WORK tra-la tra-la - I've got a kiln load
of bisque waiting to be tested on.
- Veronica
____________________________________________________________________________
Veronica Shelford
e-mail: shelford@island.net
s-mail: P.O. Box 6-15
Thetis Island, BC V0R 2Y0
Tel: (250) 246-1509
____________________________________________________________________________
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