Paul Lewing on wed 21 apr 04
on 4/21/04 2:28 AM, May Luk at yamerica@BTOPENWORLD.COM wrote:
> Clear Pale Pink Glaze - Cone 8 Ox
> Nepheline Syenite____26
> Lithium Carb_________10
> Barium Carb__________3
> Calcium Borate Frit__5
> Tin Oxide____________4
May, this is very similar to a midrange oxidation glaze known as Icing. In
the color variation above it's known as Pink Icing, but I've seen it called
Aqua Icing when a little copper is added. I've been testing it a lot lately
with different colorants. It's really lavender if you add a little cobalt
to the above.
> 1-Can I kill the barium? I don't have it and I don't want to buy it. [skull
> and bones] Replace with Strontium Carb?
This is a very odd glaze, and its color response is likely due to the
combination of all its ingredients, although it's also possible that
chrome-contaminated rutile is a possibility.
> 2-10 % lithium is not good either, can I also kill it and sub it with more
> whiting/Wallasonite-calcium or frits? A weaker and cheaper flux will do, no?
See above, and remember that if you change the glaze, it's a different
glaze. So you may get similar fluxing, but don't expect surface, color, and
fit to all be the same if you substitute different fluxes. Also, I'll say
again that using a cheaper flux (or any other kind of ceramic material) is a
false economy if it doesn't look right.
> 3-From my limited experience, I think Si:Al at 15.04 is not right, don't I
> need some clay for better suspension also?
The midrange version of this has some Gerstley Borate, so it doesn't settle.
But again, don't expect this glaze to behave the same if you change this
ratio. One of the ways the version I'm familiar with is odd, is that it's a
runny matte glaze, and that's because it has so little alumina. But 2%
bentonite might solve the problem without too much effect on the effect.
> 4-The AL2O3 at 0.187 is not a cone 8 glaze. More like a cone 02. Am I right?
> 5-Should I just start with a High alkaline-calcium base glaze and add tin
> and rutile and see what happens?
Of course you should. Any time the thought, "Should I try that?" crosses
your mind, the answer should always be, "Yes".
Paul Lewing, Seattle
Ivor and Olive Lewis on thu 22 apr 04
Dear May Luc,
I have been testing some of the Rare Earth Oxides. Erbium Oxide gives
a delicate pink.
If you need the name of a European Supplier, contact me Off List.
Ivor Lewis. Redhill, South Australia
Alisa Liskin Clausen on fri 23 apr 04
On Wed, 21 Apr 2004 21:12:52 -0800, Paul Lewing
>on 4/21/04 2:28 AM, May Luk at yamerica@BTOPENWORLD.COM wrote:
>> Clear Pale Pink Glaze - Cone 8 Ox
>> Nepheline Syenite____26
>> Lithium Carb_________10
>> Barium Carb__________3
>> Calcium Borate Frit__5
>> Tin Oxide____________4
When I tested this glaze, the color and surface were nice. However, a few
days later, it shivered very badly. There was very little glaze that
stayed adhered to the claybody. My usual white mid range stoneware.
regards from Alisa in Denmark
David Hewitt on sat 24 apr 04
I don't think there is much doubt that the shivering is because of the
10% lithium carbonate. Very funny things happen when it is as high as
this. I would put a maximum of 5% in any recipe or 0.2 mol parts.
In message , Alisa Liskin Clausen writes
>On Wed, 21 Apr 2004 21:12:52 -0800, Paul Lewing
>>on 4/21/04 2:28 AM, May Luk at yamerica@BTOPENWORLD.COM wrote:
>>> Clear Pale Pink Glaze - Cone 8 Ox
>>> Nepheline Syenite____26
>>> Lithium Carb_________10
>>> Barium Carb__________3
>>> Calcium Borate Frit__5
>>> Tin Oxide____________4
>When I tested this glaze, the color and surface were nice. However, a few
>days later, it shivered very badly. There was very little glaze that
>stayed adhered to the claybody. My usual white mid range stoneware.
>regards from Alisa in Denmark
David Hewitt Pottery
South Wales UK