Alisa Clausen on mon 23 feb 04
Dear Nana,
If you and the studio are using the crystal glaze to get an overlapping
effect on some of the other well liked glazes, you may consider a clear base
with rutile. I have experimented with bases by adding 5-10 % and using them
on the rims or inside of pots that are glazed with something else.
The results are very varied and quite like you say, brings out light in some
of the darker glazes.
In a simple explanation I make for myself, this happens because the rutile
is a mixture of Titanium oxide, an opacifier, and Iron oxide, which is a
fluxing oxide. For example, when I overlap the Rutile base on a dark green
glaze, the result is whites and pinks. When I use it over an iron rich
glaze, it runs dramatically and becomes opalescent in areas.
It could be an alternative for an effect you like.
regards from Alisa in Denmark
Alisa Clausen on mon 23 feb 04
Dear Nana,
I notice that the recipe you gave has 3.8 grams of Rutile in it. The recipe
suggested by Rubia is a base 100 gr. with 4% Rutile added.
I am suspecting that the effect you and your colleagues like is achieved
with a base with Rutile added. You can achieve this with a glaze base that
is not
as runny as a crystal glaze, but it will move enough to give you what you
describe as "light" in the
underlying glaze. There may be some relevant information in the archives
under a heading like
overlapping glazes.
I have experimented with bases by adding 5-10 % Rutile in them, and using
them on the rims or inside of pots that are glazed with something else.
The results are very varied. Always fluid, streaking and many color
nuances. They should be kept high on the lip of the pot or on the inside.
'
They will move, but not drip off if kept high enough. However, there is
still the risk that the
glaze will drip if too thick or again, not high enough or inside the pot. I
would suggest
also under for your tests. I make strips from my extruder and bisque them,
before I put
them under tests. I do this, actually, for almost all of my tests. Too
much scraping in the past
because of one small tile that dripped.
In a simple explanation I make for myself, this happens because the rutile
is a mixture of Titanium oxide, an opacifier, and Iron oxide, which is a
fluxing oxide. For example, when I overlap the Rutile base on a dark green
glaze, the result is whites and pinks. When I use it over an iron rich
glaze, it streaks dramatically and becomes opalescent in areas.
A base, like Rubias, or dozens of others, with 4-&6% Rutile added, could be
a substitution for the crystal glaze.
regards from Alisa in Denmark
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