May Luk on sun 16 apr 06
Hello all;
My friend who works in maiolica would like to shift
her tin white earthenware glaze from low-sol. to
unleaded. So we started a new glaze project together.
I have not worked in earthenware for a long time. I do
not even have the limits for earthenware glaze - only
the one from the Hamer Dictionary. I found this recipe
called Seagull White. (Most other recipes that I can
find are lead based) I need some help to ‘read’ it. I
will also use tin in place of titanium in the ‘seagull
white’ glaze below.
The final glaze is going to be used with an airbrush.
Our plan is to find a couple more recipes to fire the
first round to see the clay-glaze interaction. Then we
will pick one to do some grids. Any suggestions are
much appreciated.
Many thanks
May
LondON, UK
***************************************
Seagull white *
(1040-1080C)
High alkaline frit 29
Lithium Carb 5
Calcium Borate Frit 19.5
China Clay 15
Quartz 26
Titanium Oxide 4.5
***************************************
Na2O___0.096
K2O____0.115
MgO____0.011
CaO____0.778
Al2O3___0.301
B2O3___0.155
Fe2O3___0.003
SiO2____3.276
TiO2____0.009
Si:Al____10.89
COE____72.08 (Glazemaster)
LOI_____9.66
*Warshaw, Josie, The Complete Practical Potter,
London, Lorenzo Books, P.189
lee love on mon 17 apr 06
May,
I have had good luck with Linda Arbuckle's majolica. Her article
disappeared from the SDSU web page, but I found it in the WayBack
archives and posted it to this weblog: http://claycraft.blogspot.com/
The article might help you tweek the glaze you are working on.
--
Lee In Mashiko, Japan
http://togeika.googlepages.com/
http://seisokuro.blogspot.com/
"Bring me my Bow of burning gold;
Bring me my Arrows of desire;
Bring me my Spear; O clouds unfold!
Bring me my Chariot of fire! "
--William Blake
Kathy Forer on mon 17 apr 06
On 4/17/06, lee love wrote:
> I have had good luck with Linda Arbuckle's majolica. Her article
> disappeared from the SDSU web page, but I found it in the WayBack
> archives and posted it to this weblog: http://claycraft.blogspot.com/
By coincidence I came across the original of this last night.
http://ceramics.sdsu.edu/articles/arbucklemajolica.html
--
Kathy Forer
http://www.foreverink.com
Ron Roy on tue 18 apr 06
Hi May - there are two limit sets in my glaze workshop book.
It looks like the SiO2 is over in both sets.
Boron is way low as well.
With some bodies 5% Lith Carb may bring on serious fit problems - 2% would
be more prudent.
Perhaps less alkaline frit and more boron frit to keep the expansion down.
Best to use this over a high talc body to help with the crazing and
rehydration problems of underfired clays.
Wish I knew more about low fired glazes - I usually say - go to cone 6 and
make it easy to deal with the functional problems.
RR
>My friend who works in maiolica would like to shift
>her tin white earthenware glaze from low-sol. to
>unleaded. So we started a new glaze project together.
>I have not worked in earthenware for a long time. I do
>not even have the limits for earthenware glaze - only
>the one from the Hamer Dictionary. I found this recipe
>called Seagull White. (Most other recipes that I can
>find are lead based) I need some help to =91read=92 it. I
>will also use tin in place of titanium in the =91seagull
>white=92 glaze below.
>
>The final glaze is going to be used with an airbrush.
>
>Our plan is to find a couple more recipes to fire the
>first round to see the clay-glaze interaction. Then we
>will pick one to do some grids. Any suggestions are
>much appreciated.
>
>Many thanks
>May
>LondON, UK
>***************************************
>Seagull white *
>(1040-1080C)
>
>High alkaline frit 29
>Lithium Carb 5
>Calcium Borate Frit 19.5
>China Clay 15
>Quartz 26
>Titanium Oxide 4.5
>***************************************
>Na2O___0.096
>K2O____0.115
>MgO____0.011
>CaO____0.778
>Al2O3___0.301
>B2O3___0.155
>Fe2O3___0.003
>SiO2____3.276
>TiO2____0.009
>Si:Al____10.89
>COE____72.08 (Glazemaster)
>LOI_____9.66
>
>*Warshaw, Josie, The Complete Practical Potter,
>London, Lorenzo Books, P.189
>
>___________________________________________________________________________=
___
>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
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Ruth Ballou on tue 18 apr 06
Hi May,
I believe that grids will not be as useful at this temp. There's just =20=
too much flux in them and you won't see much variation over 35 =20
glazes. Perhaps a much smaller grid would be helpful.
Ruth Ballou
Belgium
On Apr 16, 2006, at 11:50 AM, May Luk wrote:
> Hello all;
>
> My friend who works in maiolica would like to shift
> her tin white earthenware glaze from low-sol. to
> unleaded. So we started a new glaze project together.
> I have not worked in earthenware for a long time. I do
> not even have the limits for earthenware glaze - only
> the one from the Hamer Dictionary. I found this recipe
> called Seagull White. (Most other recipes that I can
> find are lead based) I need some help to =91read=92 it. I
> will also use tin in place of titanium in the =91seagull
> white=92 glaze below.
>
> The final glaze is going to be used with an airbrush.
>
> Our plan is to find a couple more recipes to fire the
> first round to see the clay-glaze interaction. Then we
> will pick one to do some grids. Any suggestions are
> much appreciated.
>
> Many thanks
> May
> LondON, UK
> ***************************************
> Seagull white *
> (1040-1080C)
>
> High alkaline frit 29
> Lithium Carb 5
> Calcium Borate Frit 19.5
> China Clay 15
> Quartz 26
> Titanium Oxide 4.5
> ***************************************
> Na2O___0.096
> K2O____0.115
> MgO____0.011
> CaO____0.778
> Al2O3___0.301
> B2O3___0.155
> Fe2O3___0.003
> SiO2____3.276
> TiO2____0.009
> Si:Al____10.89
> COE____72.08 (Glazemaster)
> LOI_____9.66
>
> *Warshaw, Josie, The Complete Practical Potter,
> London, Lorenzo Books, P.189
>
> ______________________________________________________________________=20=
> ________
> 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 =20
> melpots@pclink.com.
>
May Luk on wed 19 apr 06
Hello Lee, Kathy, Mike, David, Ron, Ruth and
everybody;
Thank you for your tips and links. They are much
appreciated. I am keen to apply what I’ve learnt. I
shall report back with my progress.
Ron: I dug out the booklet and I have the limits. Hmm,
no LiO2.
David Hewitt kindly reminded me to be more precise
with my COE quote. It was West & Gerrow calculated
from Glazemaster.
Mike: Russell and I went to Daphne Carnegy’s open
studio a few years back. Her studio is only a few
miles from where I live! I forgot that she has a book
about Majolica. I know that she uses low solubility
glaze and it passed a random glaze test in the States
once.
With compliments
May
LondON, UK
P.S. Earl; very good link on the ‘whatismaiolica’.
P.S.S. April 23 reminder – St George Day and William
Shakespeare’s birthday. No known connection to
maiolica.
Ron Roy on wed 19 apr 06
Hi May,
I do think Li2O would be useful - I don't know why it is not included in
the limits - it should be because it is a useful low fire flux with a low
expansion.
Just be careful where you get it - look for a frit with some in it.
RR
>Ron: I dug out the booklet and I have the limits. Hmm,
>no LiO2.
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Eleanora Eden on wed 10 may 06
Hi May,
I use petalite or spodumene to get the LiO2.
Eleanora
>Hi May,
>
>I do think Li2O would be useful - I don't know why it is not included in
>the limits - it should be because it is a useful low fire flux with a low
>expansion.
>
>Just be careful where you get it - look for a frit with some in it.
>
>RR
>
>
>>Ron: I dug out the booklet and I have the limits. Hmm,
>>no LiO2.
>
>Ron Roy
>RR#4
>15084 Little Lake Road
>Brighton, Ontario
>Canada
>K0K 1H0
>
>______________________________________________________________________________
>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.
--
Bellows Falls Vermont
www.eleanoraeden.com
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