ivor & olive lewis on sun 16 aug 09
Had a look for recipes that incorporate Bone Ash. Little if anything
enlightening in Rhodes, Cooper and Royale or elsewhere.
Chappell has two white firing bodies with Bone Ash.
In Porcelain glazes he has PG 4, PG 18, PG 26. All having only a small
fraction of bone ash.
A sources of Phosphorus Pentoxide, has anyone done a comparative study of
Plant Ash and Bone Ash as glaze ingredients ? I would be interested in
knowing if anyone has produced a Strong Blue Chun (Jun) using Bone Ash or i=
f
this effect is being produced from Fly Ash during wood burnings.
Best regards,
Ivor Lewis,
Redhill,
South Australia
Marcia Selsor on sun 16 aug 09
I always thought bone ash was a necessary ingredient for iron reds to
form crystals ( not macro crystals)
I believe that was in Pioneer Pottery or Rhodes.
Marcia
Marcia Selsor
http://marciaselsor.com
Des & Jan Howard on sun 16 aug 09
Ivor
Two of our glazes use bone ash, 1.25% each.
A Jun type blue glaze & a rose copper glaze derived
from the Jun. The bone ash gives a blue bloom to the red.
or
or
Des
ivor & olive lewis wrote:
> I would be interested in
> knowing if anyone has produced
> a Strong Blue Chun (Jun) using Bone Ash
--
Des & Jan Howard
Lue Pottery
Lue NSW
Australia
2850
02 6373 6419
www.luepottery.hwy.com.au
-32.656072 149.840624
gary navarre on sun 16 aug 09
I was starting to think in that direction with my 40/40/20 slip glaze with=
fern ash, one with Maple ash, and another with Balsam ash. What would you =
propose, 40% bone ash instead of the plant ash? So far I've used Custer, Ko=
na-4, or Cornwall Stone for the feldspar and a pinch of oxides for color. S=
ince I can't find my rutile I'm using 4% Titanium dioxide in some samples. =
There will be a slight problem though, I neglected to mark what went on whe=
re so I'll have to figure out what was what glaze on which clay body after =
the firing is done. On some pieces I left the glaze thin so I can look for =
fly ash areas in the chamber. I'm thinking the tail might be productive for=
deposits...
http://public.fotki.com/GindaUP/ca/kpap/lc/ashdepositinchimneybase3.html
Gary Navarre
Navarre Pottery
Navarre Enterprises
Norway, Michigan, USA
http://www.youtube.com/GindaUP
http://public.fotki.com/GindaUP/
--- On Sun, 8/16/09, ivor & olive lewis wrote:
> From: ivor & olive lewis
> Subject: [Clayart] : Re: bone ash
> To: Clayart@LSV.CERAMICS.ORG
> Date: Sunday, August 16, 2009, 1:24 AM
> Had a look for recipes that
> incorporate Bone Ash. Little if anything
> enlightening in Rhodes, Cooper and Royale or elsewhere.
> Chappell has two white firing bodies with Bone Ash.
> In Porcelain glazes he has PG 4, PG 18, PG 26. All having
> only a small
> fraction of bone ash.
>
> A sources of Phosphorus Pentoxide, has anyone done a
> comparative study of
> Plant Ash and Bone Ash as glaze ingredients ? I would be
> interested in
> knowing if anyone has produced a Strong Blue Chun (Jun)
> using Bone Ash or if
> this effect is being produced from Fly Ash during wood
> burnings.
>
> Best regards,
> Ivor Lewis,
> Redhill,
> South Australia
>
gary navarre on tue 18 aug 09
Ya Ivor, I'll probably use the lower % for starters. And now I know what he=
lped cause the neat effect I got with Apple ash in my earlier kiln. It was =
definitely not runny like pine but more opaque satin matt. Guess I need to =
make another smaller Koie cooker and make some more Apple ash.
Gary Navarre
Navarre Pottery
Navarre Enterprises
Norway, Michigan, USA
http://www.youtube.com/GindaUP
http://public.fotki.com/GindaUP/
--- On Sun, 8/16/09, ivor & olive lewis wrote:
> From: ivor & olive lewis
> Subject: Re: [Clayart] : Re: bone ash
> To: "gary navarre"
> Cc: "American Ceramic Society"
> Date: Sunday, August 16, 2009, 9:16 PM
> "I was starting to think in that
> direction with my 40/40/20 slip glaze with fern ash, one
> with Maple ash, and another with Balsam ash. What would you
> propose, 40% bone ash instead of the plant ash?"
>
> Hello there Gary,
> Considering that most plant ashes, depending on their
> source, contain only low volumes of Phosphorus Pentoxide
> (See Cardew, Leech etc for examples} ( Apple seems to be an
> exception.) 40% bone ash would seem to be overkill if you
> are seeking to create Chun (Jun) style glazes.
> Might pay you to read what Nigel Wood has to say in both of
> his books. He gives formulae that can be converted to
> recipes
> This is not to say a glaze is impossible with 40%
> Tri-Calcium Phosphate. Just run a trial with all three
> melters.
> Just keep on trying and noting the effects.
> Best regards.
> Ivor Lewis,
> Redhill,
> South Australia
>
>
>
>
| |
|
