John Post on thu 2 jun 05
Some of the potential problems with the white recipes that I have seen
posted in this thread include...
They have Gerstley Borate in them (a variable material that gels and can
cause problems in a slurry).
They have tin in them - certain Mason stains and chrome may cause white
glazes made with tin to blush pink.
Some have too little clay to work well as a slurry- I like my glazes to
have 10% clay at the minimum, with closer to 20% making for a better
application. Glazes with too little clay may settle out in the bucket.
So with that in mind here is a base glaze that I use...
Post's White ^6 Glossy
16 EPK
21 Frit 3134
19 Nepheline Syenite
20 Wollastonite
24 Flint
add
15 Superpax
I use this base glaze in a teaching situation with elementary age kids
grades K-6.
We have glazed thousands of pieces with this over the last few years and
there are never any problems with crawling or the slurry settling out or
turning to gel.
Cheers,
John Post
darrell calhoun on thu 2 jun 05
I need a super white, opaque cone six glaze. Can anyone send me a recipe?
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Kathy Rhoades on thu 2 jun 05
Here's a cone 6 white we use in class:
White Satin Matte
Berstley borate 31.63
Talc 13.95
Kona F-4 19.80
EPK 4.98
Silica 29.64
Add:
Zicopax 5.11
Bentonite 1.99
put it on pretty even, gives a nice white.
Kathy
darrell calhoun wrote:
I need a super white, opaque cone six glaze. Can anyone send me a recipe?
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marianne kuiper milks on thu 2 jun 05
--- darrell calhoun wrote:
> I need a super white, opaque cone six glaze. Can
> anyone send me a recipe?
>
>
Try
potash feldspar 46.7
china clay 4.0
bentonite 2.0
bone ash 15.0
lithium carbonate 4.0
talc 16.9
flint or quartz 11.4
This is OR1 from Baileys. It is a super-white glaze
and is can be changed to really beautiful reds/oranges
by adding various amts. of red iron oxide. I tried it
and it worked for me.
Marianne
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lela martens on thu 2 jun 05
Hi Darren,
Here`a a super white glaze written as a fellow guild member passed on to
me. It`s so white I`m thinking of what I might change to calm it down. Has a
nice smooth, silky finish on the test tile and two little bowls I`ve done so
far.
Silky white cone 6
neph syenite ----------- 480
flint ----------------------- 250
whiting ------------------ 180
zinc oxide --------------- 80
EPK ----------------------- 80
tin oxide ---------------- 40
Best wishes,
Lela
>From: darrell calhoun
>Reply-To: Clayart
>To: CLAYART@LSV.CERAMICS.ORG
>Subject: White, white cone 6 glaze
>Date: Thu, 2 Jun 2005 09:49:00 -0700
>
>I need a super white, opaque cone six glaze. Can anyone send me a recipe?
>
>
>---------------------------------
>Yahoo! Mail Mobile
> Take Yahoo! Mail with you! Check email on your mobile phone.
>
>______________________________________________________________________________
>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.
darrell calhoun on fri 3 jun 05
thanks
John Post wrote:Some of the potential problems with the white recipes that I have seen
posted in this thread include...
They have Gerstley Borate in them (a variable material that gels and can
cause problems in a slurry).
They have tin in them - certain Mason stains and chrome may cause white
glazes made with tin to blush pink.
Some have too little clay to work well as a slurry- I like my glazes to
have 10% clay at the minimum, with closer to 20% making for a better
application. Glazes with too little clay may settle out in the bucket.
So with that in mind here is a base glaze that I use...
Post's White ^6 Glossy
16 EPK
21 Frit 3134
19 Nepheline Syenite
20 Wollastonite
24 Flint
add
15 Superpax
I use this base glaze in a teaching situation with elementary age kids
grades K-6.
We have glazed thousands of pieces with this over the last few years and
there are never any problems with crawling or the slurry settling out or
turning to gel.
Cheers,
John Post
______________________________________________________________________________
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.
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Ron Roy on fri 3 jun 05
This glaze has a high calculated expansion so it is going to craze on many
cone 6 bodies.
There can also be a shivering problem on some clays with that amount of
Lithium Carb. Some times this can result in both crazing and shivering - so
test it well on the clays you are using before using it on functional ware.
David Hewitt and I did some experiments on this many years ago - David came
to the conclusion that 2% Lithium Carb was about as much that could be used
to avoid potential problems.
RR
>Try
>potash feldspar 46.7
>china clay 4.0
>bentonite 2.0
>bone ash 15.0
>lithium carbonate 4.0
>talc 16.9
>flint or quartz 11.4
>This is OR1 from Baileys. It is a super-white glaze
>and is can be changed to really beautiful reds/oranges
>by adding various amts. of red iron oxide. I tried it
>and it worked for me.
>Marianne
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Ron Roy on fri 3 jun 05
Again - the calculated expansion is high so I would expect this glaze to
craze on most cone 6 bodies.
I would recommend adding 2% bentonite - I'm sure this glaze will
deflocculate over time - because of the 45% Neph Sy content.
It may not be melted enough to be a stable glaze - it would need testing to
find that out.
I have used a small amout of rutile to ware a white glaze up - it will not
take much to do the job.
RR
>Here`a a super white glaze written as a fellow guild member passed on to
>me. It`s so white I`m thinking of what I might change to calm it down. Has a
>nice smooth, silky finish on the test tile and two little bowls I`ve done so
>far.
>
>Silky white cone 6
>
>neph syenite ----------- 480
>flint ----------------------- 250
>whiting ------------------ 180
>zinc oxide --------------- 80
>EPK ----------------------- 80
>tin oxide ---------------- 40
>
>Best wishes,
>Lela
>>From: darrell calhoun
>>Reply-To: Clayart
>>To: CLAYART@LSV.CERAMICS.ORG
>>Subject: White, white cone 6 glaze
>>Date: Thu, 2 Jun 2005 09:49:00 -0700
>>
>>I need a super white, opaque cone six glaze. Can anyone send me a recipe?
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Neal on fri 3 jun 05
Darrell: I've been using a variation of Tony Hansen's 20x5
recipe. It has worked well for me with 9 percent Superpax
added. His website
mentions adding 10 percent to 15 percent Superpax, so
apparently it's adaptable to having even more than I use.
Wollastonite 17
Frit 3134 18
EPK 21
Silica 24
Custer Feldspar 17
Lithium Carbonate 2*
Add Superpax 10
*I know this only adds up to 99. The original version on
the website gives 3 percent for the lithium carbonate. It
works for my clays with 2 percent.
I'm using Highwater's red rock and red stone clays. They're
a rich reddish brown--much richer and darker than the
Highwater website photos. The red rock has granular
manganese, which shows through my white glaze. The red
stone clay doesn't show through at all.
Neal O'Briant
neal126@yahoo.com
> I need a super white, opaque cone six glaze. Can anyone
> send me a recipe?
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lela martens on fri 3 jun 05
Hi Ron,
I was hoping you would join in here.
I am slowly plodding my way through glaze chemistry, so my knowlege is
precarious. One conclusion I have come to so far is that the main clay
bodies I use must be quite forgiving. Plainsman M340 and M390. Haven`t done
the lemon test to this yet, but have looked carefully for crazing and found
none there so far.
I am going to play around a bit with colour and one will be with rutile,
thanks. The finish on this glaze is so nice as well as no blisters etc,
thick or thin. I have hopes for it. will also test on Laguna B mix.
Do you have any hints so far as to various oxides?
Thanks, Lela
>From: Ron Roy
>Again - the calculated expansion is high so I would expect this glaze to
>craze on most cone 6 bodies.
>
>I would recommend adding 2% bentonite - I'm sure this glaze will
>deflocculate over time - because of the 45% Neph Sy content.
>
>It may not be melted enough to be a stable glaze - it would need testing to
>find that out.
>
>I have used a small amout of rutile to ware a white glaze up - it will not
>take much to do the job.
>
>RR
>
>
> >Here`a a super white glaze written as a fellow guild member passed on to
> >me. It`s so white I`m thinking of what I might change to calm it down.
>Has a
> >nice smooth, silky finish on the test tile and two little bowls I`ve done
>so
> >far.
> >
> >Silky white cone 6
> >
> >neph syenite ----------- 480
> >flint ----------------------- 250
> >whiting ------------------ 180
> >zinc oxide --------------- 80
> >EPK ----------------------- 80
> >tin oxide ---------------- 40
> >
Ron Roy on sat 4 jun 05
This glaze has a very low expansion rate - test it well for dunting on all
the clays you use - glaze just the inside of a cylinder - mug size - apply
the glaze a little on the thick side - leave the out side unglazed.
After firing put it in the freezer for 24 hours - then pour boiling water
in (in the sink.)
I tried to convert this to use frits but it's so high in MgO I could not
with the commonly available ferro frits.
The problem is also - if you keep the MgO high you also keep the expansion
low - so trying to get the GB out and raise the expansion are incompatible
with keeping it the same type of glaze.
RR
>Here's a cone 6 white we use in class:
>
>White Satin Matte
>Berstley borate 31.63
>Talc 13.95
>Kona F-4 19.80
>EPK 4.98
>Silica 29.64
>
>Add:
>Zicopax 5.11
>Bentonite 1.99
>put it on pretty even, gives a nice white.
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Ron Roy on sat 4 jun 05
I must concur with John - this glaze is well balanced - will not be a fit
problem on most clays - it might even be stable but - remember - when we
tested additions of zircopax (super pax is nearly the same) the stability
suffered - see page 56/57.
RR
>Some of the potential problems with the white recipes that I have seen
>posted in this thread include...
>
>They have Gerstley Borate in them (a variable material that gels and can
>cause problems in a slurry).
>They have tin in them - certain Mason stains and chrome may cause white
>glazes made with tin to blush pink.
>Some have too little clay to work well as a slurry- I like my glazes to
>have 10% clay at the minimum, with closer to 20% making for a better
>application. Glazes with too little clay may settle out in the bucket.
>
>So with that in mind here is a base glaze that I use...
>
>Post's White ^6 Glossy
>16 EPK
>21 Frit 3134
>19 Nepheline Syenite
>20 Wollastonite
>24 Flint
>add
>15 Superpax
>
>I use this base glaze in a teaching situation with elementary age kids
>grades K-6.
>We have glazed thousands of pieces with this over the last few years and
>there are never any problems with crawling or the slurry settling out or
>turning to gel.
>
>Cheers,
>John Post
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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