Carolynn Palmer on wed 19 may 04
I've been searching the archives and find 3 references/discussions about Opal
Blue Glaze, but not one hint of a glaze recipe.
Does anyone have the recipe and firing range for this glaze?
Thanks in advance! Carolynn Palmer, Somerset Center, Michigan
Randy McCall on wed 19 may 04
Chris Schafale gave me this Opal Blue recipe, but I am not sure where it =
came from. It is wonderfully consistent everytime.
Frit 3134 50
Kaolin 25
SILICA 25
COBALT 1
RUTILE 4
I usually mix it to the texture of cream and pour on two coats, just =
make sure you do not get too much in the bottom or it will pin hole =
where it collects at the bottom of the pot. Usually brushes on well =
also. I have also used 3134 40% and GB 10% to help brushability.
Wonderfully smooth shiny glaze
----- Original Message -----=20
From: Carolynn Palmer=20
To: CLAYART@LSV.CERAMICS.ORG=20
Sent: Wednesday, May 19, 2004 5:57 PM
Subject: Opal Blue - Cone 6?
I've been searching the archives and find 3 references/discussions =
about Opal
Blue Glaze, but not one hint of a glaze recipe.
Does anyone have the recipe and firing range for this glaze?
Thanks in advance! Carolynn Palmer, Somerset Center, Michigan
=
_________________________________________________________________________=
_____
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.
Ivor and Olive Lewis on thu 20 may 04
Dear Carolynn Palmer,
I would presume you are not referring to actual blue hues that are
observed in Gem Opal
that may range from deep intense violet blue through to the shimmering
green blue lights that shine from some of the best Queensland Boulder
Opal, but rather the opalescence that has a blue cast to it which
clouds some glazes.
Chappell tells us (p141) that this effect is common to glazes which
have a good load of Boron in the glaze composition saying " Boron
Glazes often tend to give a milky opalescent quality with bluish hues,
especially if Colemanite is used to supply the boron content" I have
found the same quality is common to high Boron Frits. Chappell goes on
to emphasise the effect can be enhanced by adding small quantities of
Ilmenite.
My suggestion would be to take your own reliable Cone Six Transparent
Glaze and do some line blending if recipes are not readily to hand.
Play with the boron compounds of your choice first and when you get a
good response, start to bring in the Ilmenite.
Best regards,
Ivor Lewis. Redhill, South Australia
Donald Burroughs on thu 20 may 04
Purple Opal
Gerstley Borate 140
Spodumene 300
EPkaolin 50
Dolomite 70
Talc 130
Flint 200
Rutile 60
Add:
Manganese Dioxide 10 (powdered)
Note:amounts are batch weight.
To make blue I would add the standard percentage of Cobalt Carbonate
Try 4 to 6% Copper Carbonate (very nice results!)
Also try line blending this glaze with other glazes.
You will often get surprising results.
Donald Burroughs
Ron Hollister on thu 20 may 04
Carolynn,
Following is another receipt for a cone 6 oxidation fire Opal Blue, I =
haven't used it in a while but use the base for a number of other =
glazes.
Ron Hollister
Custer Feldspar 3784
Silica 2495
Gerstley Borate 2287
Strontium Carbonate 312
Whiting 1123
also add
Cobalt Carbonate 40
Rutile 300
----- Original Message -----=20
From: Carolynn Palmer=20
To: CLAYART@LSV.CERAMICS.ORG=20
Sent: Wednesday, May 19, 2004 4:57 PM
Subject: Opal Blue - Cone 6?
I've been searching the archives and find 3 references/discussions =
about Opal
Blue Glaze, but not one hint of a glaze recipe.
Does anyone have the recipe and firing range for this glaze?
Thanks in advance! Carolynn Palmer, Somerset Center, Michigan
=
_________________________________________________________________________=
_____
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.
Ron Roy on sat 22 may 04
Yes - a cone 6 glaze but it is short of alumina so it might run - and may
not do well in a dish washer. Alumina is what provides protection from
alkaline attack.
RR
>Custer Feldspar 3784
>Silica 2495
>Gerstley Borate 2287
>Strontium Carbonate 312
>Whiting 1123
>
>also add
>
>Cobalt Carbonate 40
>Rutile 300
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Earl Brunner on sun 23 may 04
I approved it Ron, it just got lost in the ether.
From: ronroy@ca.inter.net (Ron Roy)
Subject: Re: Opal Blue - Cone 6?
Yes - a cone 6 glaze but it is short of alumina so it might run - and may
not do well in a dish washer. Alumina is what provides protection from
alkaline attack.
RR
>Custer Feldspar 3784
>Silica 2495
>Gerstley Borate 2287
>Strontium Carbonate 312
>Whiting 1123
>
>also add
>
>Cobalt Carbonate 40
>Rutile 300
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Earl Brunner
Las Vegas, NV
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