Lynn Koning on mon 23 aug 99
just made some flower pots from Lizella terra cotta clay. I wanted to put
touches of green glaze here and there on them so I bought some low-fire
commercial glaze. it all came out brown. suppose it's the iron and other
components in the clay reacting with the glaze. any suggestions on how I can
get green glaze on these pots? TIA
Lynn in L.A. (lower Alabama and the cotton is high)
Diane Karmiol on tue 24 aug 99
Hi Lynn,
Put your glaze on top of white underglaze (2 coats) and fire once.
Should come out fine.
Diane in Miami
Lana Reeves on tue 24 aug 99
Try this one-- nice sea greyish green on terracotta.
Taberg Base:
Frit 3124 50
OM-4 6
Flint 13
Gerstley borate 27
Titanium Diox. 2
Zinc Oxide 2
Total: 100 add: Bentonite 2%, Copper carb 2%, yellow ochre 3%
This is a glossy glaze. You can try other oxides-- or mason stains. Don't
use anything with chrome in it, the zinc turns it brown. If you're looking
for something more satin, or matte, e-mail me.
Lana in Somerville, MA
kilnkat@rcn.com =^..^=
"where cats & clay collide"
-----Original Message-----
From: Lynn Koning
To: CLAYART@LSV.UKY.EDU
Date: Monday, August 23, 1999 5:16 PM
Subject: Re: glaze on terra cotta
>----------------------------Original message----------------------------
>just made some flower pots from Lizella terra cotta clay. I wanted to put
>touches of green glaze here and there on them so I bought some low-fire
>commercial glaze. it all came out brown. suppose it's the iron and other
>components in the clay reacting with the glaze. any suggestions on how I
can
>get green glaze on these pots? TIA
>
>Lynn in L.A. (lower Alabama and the cotton is high)
Alex Wilson on tue 24 aug 99
In a message dated 8/23/99 4:13:06 PM Central Daylight Time,
PotterBme@aol.com writes:
<< just made some flower pots from Lizella terra cotta clay. I wanted to put
touches of green glaze here and there on them so I bought some low-fire
commercial glaze. it all came out brown. suppose it's the iron and other
components in the clay reacting with the glaze. any suggestions on how I can
get green glaze on these pots? TIA
Lynn in L.A. (lower Alabama and the cotton is high) >>
Is the living easy, though?
Maybe the glaze you used was a clear with some copper added; you could get
around this by finding/formulating an opaque green glaze or do what I do and
use green slip under a clear glaze, or put some white slip on and then cover
those areas with your current batch o' green.
Good Luck,
Alex
ababy sharon on tue 24 aug 99
Hi!
Any glaze testing has to be on the clay that you are going to work
with.(includes commercial glazes)
Second:My old kiln arrived hardly to 1000C so I worked a lot with Majolica
base with 5-10 Tin or 10-15 Zircopax and some colorants. turns nicer on tera
cotta (it is like painting with pastels on not white peper).My majolica
works good in higher coes but you can do any 'local' majolica.I give you
here some suggestions
2,4,6, copper oxide- add 5 titanium(or not)The tin makes it quite look the
zircopax has more presence you can try it with all the colorants and have
fun.
Ababi
----- Original Message -----
From: Lynn Koning
To:
Sent: Tuesday, August 24, 1999 12:12
Subject: Re: glaze on terra cotta
> ----------------------------Original message----------------------------
> just made some flower pots from Lizella terra cotta clay. I wanted to put
> touches of green glaze here and there on them so I bought some low-fire
> commercial glaze. it all came out brown. suppose it's the iron and other
> components in the clay reacting with the glaze. any suggestions on how I
can
> get green glaze on these pots? TIA
>
> Lynn in L.A. (lower Alabama and the cotton is high)
>
Martin Howard on tue 24 aug 99
Local reduction might be the answer. Use silicon carbide. Harry Fraser
in "Glazes for the craft potter" writes on page 69:-
A good starting range for experiments would be up to 5 per cent addition
of copper or iron oxide and 3-8 per cent of silicon carbide to a
leadless glaze, adjusting the quantity of silicon carbide as necessary.
Martin Howard
Webbs Cottage Pottery and Press
Woolpits Road, Great Saling
BRAINTREE
Essex CM7 5DZ
01371 850 423
araneajo@gn.apc.org
Michele Jurist on wed 25 aug 99
Lynn:
You can first cover the areas you wish to glaze green with white underglaze
(on greenware). This will enable the green to stay its true shade of green
in the glaze firing.
Michele
Ray Aldridge on thu 26 aug 99
At 02:14 PM 8/24/99 EDT, you wrote:
>----------------------------Original message----------------------------
>In a message dated 8/23/99 4:13:06 PM Central Daylight Time,
>PotterBme@aol.com writes:
>
><< just made some flower pots from Lizella terra cotta clay. I wanted to put
> touches of green glaze here and there on them so I bought some low-fire
> commercial glaze. it all came out brown. suppose it's the iron and other
> components in the clay reacting with the glaze. any suggestions on how I
can
> get green glaze on these pots? TIA
>
> Lynn in L.A. (lower Alabama and the cotton is high) >>
>
>Is the living easy, though?
>Maybe the glaze you used was a clear with some copper added; you could get
>around this by finding/formulating an opaque green glaze or do what I do and
>use green slip under a clear glaze, or put some white slip on and then cover
>those areas with your current batch o' green.
>Good Luck,
>
When I was using Lizella, which I fired to ^7, I always used a white slip
because the clay was so dark at that work heat. The pleasant thing about
this was that any reasonably active glaze tended to eat through the slip at
edges, giving me a brown break at rims and over texture. This was very
attractive with a tin glaze.
Ray
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