ian langham on sun 8 jun 03
does any one have any decent ^6 recipes that respond well to carving ?
I have one so far but it turns an unattractive shade of brown/grey some times or just dark (obscures the carving ) in a gas firing .
i am carving on ^6 bmix and would like to find a glaze that pools over carving like a celadon or at least gives some sort of highlight to the carving ..
thanks in advance ...
Ian ...
---------------------------------
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Earl Brunner on mon 9 jun 03
A good transparent with .25% or less of cobalt carb to make a pale blue
or with a % or so of copper carb to make a light green or with a little
of both do very well.
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of ian langham
Sent: Sunday, June 08, 2003 4:37 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: ^6 glazes that are responsive to carving ...
does any one have any decent ^6 recipes that respond well to carving ?
I have one so far but it turns an unattractive shade of brown/grey some
times or just dark (obscures the carving ) in a gas firing .
i am carving on ^6 bmix and would like to find a glaze that pools over
carving like a celadon or at least gives some sort of highlight to the
carving ..
thanks in advance ...
Ian ...
---------------------------------
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John Post on mon 9 jun 03
Hi Ian,
This is a nice glaze for breaking textures in an electric kiln. It is
expensive to make and the glaze gurus will tell you that it is not food safe
and that the expansion is too low...even though it has all of those
problems, it is a great glaze over carved surfaces that do not come in
direct contact with food. (and here's irony, Tom's glaze is shivering
because of its 10% lithium and here I am recommending one with 7%... I
must add that I have never had problems with this one shivering.)
+++++++++++++++++++++++++++++++++++++++++++++++++++
+++ *MPB - Mackersie Purple Blue Satin Matt +++
+++++++++++++++++++++++++++++++++++++++++++++++++++
Range: cone 6-8
Firing type: Oxidation
Glaze type: Stoneware
Color: Mottled blue jean color with purple crystals
Surface: Satin
Date: 07/23/97
EPK 1600 20 %
Dolomite 2160 27 %
Nepheline syenite 1280 16 %
Flint 2400 30 %
Lithium carbonate 560 7 %
-------- ------
8000 100 %
Cobalt carbonate 640 8 %
Tin oxide 960 12 %
Pearl ash 40 0.5%
Notes:
From the Lana Wilson book.
Cost: $ 6.90 per kg glaze
$ 55.21 per 8000 g batch
===========================
Chemical Analysis
===========================
Na2O 0.05 Al2O3 0.23 SiO2 1.65
K2O 0.02 SnO2 0.16
MgO 0.30
CaO 0.30
Li2O 0.19
CoO 0.14
Alumina:Silica ratio is 1.00 : 7.16
Neutral:Acid ratio is 1.00 : 7.86
Alkali:Neutral:Acid ratio is 1.00 : 0.23 : 1.81
Expansion coefficient: 67.4 x 10e-7 per degree C
Oxides causing abnormal expansion effects: Li2O
Cheers,
John Post
............................................................................
.
Ian asked...
does any one have any decent ^6 recipes that respond well to carving ?
I have one so far but it turns an unattractive shade of brown/grey some
times or just dark (obscures the carving ) in a gas firing .
i am carving on ^6 bmix and would like to find a glaze that pools over
carving like a celadon or at least gives some sort of highlight to the
carving ..
thanks in advance ...
Ian ...
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