Maggie Furtak on tue 13 dec 11
Hey Gina et al,=3DA0=3D0A=3D0ASnip!=3D0A=3D0A"The red/pink glaze has been f=
ired at my=3D
=3DA0home kiln with platinum thermals and the kiln is always hot 2252 for c=
on=3D
e 6 and works out a nice dark pink. BUT, when I take the cone pack out at h=
=3D
ome, it says 6 is down. At work it says 2252 and 8=3DA0at least is down!"=
=3D0A=3D
=3D0ADon't forget that heat work is different than temperature. =3DA0A diff=
eren=3D
ce in the length of the firing may also be the culprit. =3DA02252 degrees t=
ha=3D
t takes 10 hours to achieve is a different cone than 2252 degrees that take=
=3D
s 12 hours to achieve. =3DA0Cone packs measure heat work. =3DA0Not just tem=
pera=3D
ture. =3DA0Glazes also care about heat work. =3DA0Not just temperature. =3D=
A0Just=3D
like cookies. =3DA0The recipe is 10 minutes at 350 degrees or until golden=
b=3D
rown. =3DA0For a kiln the recipe is 10 hours to 2252, or until cone 6 is do=
wn=3D
, if we want to simplify things a bit. =3DA0=3D0A=3D0AAnd I'm with Mel. =3D=
A0I have=3D
a "degrees of cone bend" chart tacked up on the wall by my kiln. =3DA0I re=
fe=3D
r to it when shutting off, and record the final bend of the cones on my kil=
=3D
n log when I unload the kiln. =3DA0I don't just write down "5", I write dow=
n =3D
"5.2." =3DA0And I can see the difference in my glazes from one firing to an=
ot=3D
her. =3DA0(: =3DA0I know that in my kiln the blues need to be on the middle=
she=3D
lf, and the greens and tenmokus can tolerate being on the top and bottom sh=
=3D
elves, which are usually .2 cones cooler, but all special orders go on the =
=3D
middle shelf if I can swing it, regardless of glaze, because that shelf is =
=3D
the most consistent, regardless of how much ware I have crammed in the kiln=
=3D
. =3DA0=3D0A=3D0AKiln's cooling as we speak! =3DA0=3D0A-Maggie=3D0A=3D0APat=
e Ceramics=3D0Ap=3D
ateceramics.etsy.com=3D0Apateceramics.blogspot.com=3D0A781-956-1364=3D0A517=
Fells=3D
way East=3D0AMalden, MA=3DA0=3DA002148=3DA0
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