Ron Roy on sun 17 oct 04
Hi Folks,
Raymond is asking me about a cone 06 problem and I don't think I have
enough experience to answer him - I have put his email address at the end
of this post - or I could pass on any advice anyone might have - thanks
RR
Let me begin with a very brief introduction. My name is Raymond
Gonzalez and I am a third year grad student at New Mexico State
University. We spoke about a year ago about porcelaneous bodies and
how to compose them. I cut that discussion short as I did not want
you to spend a lot of energy on it, but I was sure at the time that I
would need your assistance in the future with something far more
important, and here it is. How's that for short? Now for my
question/dilemma:
I have been working on developing a glaze for about the past six
months. I have altered recipes, calculated recipes, and combined
ingredients spontaneously, none of which worked! There are a number
of requirements for this glaze which are: ^06, bright, glossy,
opaque, and good with color. It must be bright and shiny with dense
color saturation. I am looking for blue (Co or stain), green (Cu or
stain), and possibly violet with stains. For that reason, it must act
well with stains. I already have the hard part done, red, orange,
yellow are figured out and running! Lead is fine, as I am using them
on sculptural forms. I am using these glazes over the standard
casting body of 50 talc, 50 ball clay. The closest I have come to
composing this glaze is in altering Batz Majolica. The recipe that I
have been using is: 3124-100, SrCo3-3, Zircopax- 24, Georgia Kaolin-
15. I have substituted the frit for a leaded frit and the surface is
nice, but the problem is obvious: the Zircopax (at 20.3%) is a COLOR
KILLER! In addition, the cobalt does not react well in the recipe.
I have found commercial Duncan lead based blue glazes, but the cost of
purchasing them in quantity is prohibitive. Green does not exist! I
can not use engobes/slips or underglazes because of the brush marks
associated with them. I tried spraying with an airbrush but that
casued a lot of waste which, when dealing with commercial products, =3D
expence.
I have been looking at Fusion frit #326 which is described as a "Cone
06 Opaque Frit." Yes, I have resorted to looking at descriptions for
my answer. The composition appears to be colorant friendly with a
high sodium base. Tell me what you think'=C4=B6.
(http://www.fusionceramics.com/fritspec.htm)
Anyway, if you know of any glazes which fit my needs, or could help me
with this glaze, I would be most indebted to you. I appreciate your
help very much,
Raymond Gonzalez
Las Cruces, New Mexico USA
Raymond Gonzalez
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
=46ax: 613-475-3513=20
Ivor and Olive Lewis on tue 19 oct 04
Dear Raymond Gonzalez,
Given that you are seeking a ^06, bright,, shiny, glossy, opaque,
glaze which gives good, dense colours and are able to use Lead bearing
glazes did you ever think of basing your research around Lead
Bisilicate with Tin oxide as the opacifier? Line blending Lead
Bisilicate with a white clay would give a ball park figure for a
simple basic recipe to which could be added any of the colouring
agents and Tin Oxide. Crazing and fluidity might need controlling.
This could be done by incorporating a blend of Magnesium and Calcium
silicates. These Alkali Earth elements would also influence colours
in favourable ways.
If you are using a white firing body I cannot understand your need for
opacity. A coloured transparent glaze over a white background would
give greater intensity and depth to any colour you chose except
perhaps Nickel and Chrome compounds or stains that opacify.
As bonus, lead glazes are renowned for the vitality of the greens they
give with Copper Carbonate or Copper oxide. I seem to recollect
getting delicate a delicate violet hue using Manganese Dioxide in
mixtures incorporating a small fraction of Bone Ash.
Best regards and wishes for success,
Ivor Lewis.
Redhill,
S. Australia.
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