Judy Picard on fri 2 feb 07
=0A=0A=0A=0AI am attending a handforming class which only uses Raku clay as=
standard =0Aclay which they bisque to ^06 and oxidize glaze fire to ^5. =
=0A=0AAt home I have a substantial investment in low-fire Duncan one stroke=
, =0Acover-coat underglaze, and concepts glazes as well as Mayco Stroke & C=
oat =0Aetc. I have no home-made glazes. I've read that these glazes will ac=
tually work =0Aup to ^6 even tho they typically say ^06 on ^04 bisque. =0A=
=0AIf they will not work to ^5 would it work to bisque fire the pieces, the=
n =0Anaked fire them to ^5 and then glaze fire them to ^06.=0A=0AI believe =
that it's necessary to fire the Raku clay to ^5 for it to have =0Astrength,=
etc.=0A=0AThanks your all your help in the past.=0A=0AJudy=0A=0A=0A=0A =0A=
Judy Picard=0A=0A=0A=0A=0A =0A_____________________________________________=
_______________________________________=0ADo you Yahoo!?=0AEveryone is ravi=
ng about the all-new Yahoo! Mail beta.=0Ahttp://new.mail.yahoo.com
Snail Scott on sat 3 feb 07
At 03:03 PM 2/2/2007 -0800, you wrote:
>I am attending a handforming class
which only uses Raku clay as standard
>clay which they bisque to ^06 and
oxidize glaze fire to ^5.
>
>At home I have a substantial investment in
low-fire Duncan one stroke,
>cover-coat underglaze, and concepts glazes as
well as Mayco Stroke & Coat
>etc. I have no home-made glazes. I've read
that these glazes will actually work
>up to ^6 even tho they typically say
^06 on ^04 bisque.
Many of them do, but some get runny and
many lose their color. Duncan used to
print a chart with a short description of
what each of their products will do at ^6.
If you've got a lot of these glazes, the
chart will help you test more efficiently,
but I'd still test to see your actual
results.
>If they will not work to ^5 would it work to bisque fire the pieces, then
>naked fire them to ^5 and then glaze fire them to ^06.
Yes, although you must be careful to not brush
off the first coat when you apply the second
coat, etc. You should also expect some crazing.
>I believe that it's necessary to fire the Raku clay to ^5 for it to have
>strength, etc.
It depends on the clay. Some raku bodies
vitrify closer to ^10, and some don't even
do that. Since they are formulated to NOT
vitrify at low temperature, there may not
have meen much concern on the part of the
clay-body designer to achieve any particular
vitrification level. Your class's supplier
may know for sure.
-Snail
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