Alisa Clausen on tue 2 mar 04
Dear Anne,
Thank you for this clarification in the names of these two glazes. That is
what I have in my notes as well. I had tested the touchtone red with
various colorants (posted) with success. I had always had the recipe for
Randy's Red as "Simple Clear" or " EZ Clear) which is the old 50 GB, 30
Silica, 20 Kaolin recipe.
When I made the test for Randi's Red #2 recipe, which I call also Touchstone
Red, I said I used Ball Clay instead of F4. That was just a slip of the
hand. I used my own Feldspar. However, now I have heard from Linda Pahl
that she uses the glaze #2, very thick and does also achieve the deep reds.
So, that I will try. Still have the test cup.
Thanks for noting this, it helps me to sort out my notebook.
regards from Alisa in Denmark
Carol Tripp on tue 2 mar 04
Hi all you Iron Red at ^6 fans,
I find that putting these iron red pots into a bisque fire after the glaze
firing brings out the red. They are all brown for me at ^6 but become deep
crystallish rich red at ^05-^06. Ron Roy says this is called "striking" -
and yes, that just about describes them.
Best regards,
Carol
Dubai, UAE
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Ron Roy on thu 4 mar 04
Hi Carol - how are you?
The same thing can be done by slow cooling at the right temperature.
What the refiring to a bisque temperature does to some glazes - is give
extra time for those crystals to form - on the way up and on the way down.
Crystals form during that part of the firing while the glaze is still soft
but not actively melting. It's hard to say what temperature that is because
it is different for each glaze.
If you assume the glaze is probably still soft down to 600 C - and time how
long it takes for your bisque firing to get up to temperature from 600C and
them back down to 600 then you have some idea how long to slow your cooling
down during the glaze firing. the longer the cooling during that time the
more crystals will develope - up to a point.
What you don't want to do is start remelting the crystals that have already
formed when refiring - I would guess a low bisque (06) might work better
than one at cone 04 for many cone 6 glazes by the way - especially those
high in boron.
RR
>Hi all you Iron Red at ^6 fans,
>I find that putting these iron red pots into a bisque fire after the glaze
>firing brings out the red. They are all brown for me at ^6 but become deep
>crystallish rich red at ^05-^06. Ron Roy says this is called "striking" -
>and yes, that just about describes them.
>Best regards,
>Carol
>Dubai, UAE
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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