techniques may be adopted in an effort to vary the texture and opacity
of a glaze?
techniques are the fastest way of obtaining an overview of the textural
potential of a glaze. .
blends are a basic tool used most frequently for exploring variations
between two glazes. They can be used for exploring changes in texture
or colour variations to mention only two of many possibilities for
blend is most useful for exploring texture related variation in
the flux balance of a glaze while maintaining a constant level of
alumina and silica.
can be used for any change sequence involving an original glaze
varied in two directions e.g.
glaze A could
be the original glaze
glaze B might
be the original + more clay
glaze C might
be the original + more silica.
biaxial blends are excellent for revealing changes to a glaze resulting
when a flux group is kept constant and the Al2O3 and SiO2 content
is varied. e.g.
original glaze and remove all sources of alumina and silica without
changing the flux content. This becomes the glaze at corner C
with the corner C glaze add clay such that the molecular parts
in the unity formula for C is increased by say 0.6. This becomes
the glaze at corner A.
with glaze C add silica increasing the mol. parts for that oxide
by say 4.0.This becomes the glaze at corner D.
with glaze A add silica again increasing the mol. parts by say
4.0.This becomes the glaze at corner B.
The corner glazes
are then blended using the volumetric techniques outlined by Ian
Currie in his "A Systematic Approach to Stoneware Glazes".