Ray Carlton on fri 1 may 98
heres a teaser for the glaze experts..since i have started using my new
kiln [insulating firebrick] one of my glazes is not as glossy as it used to
be. The old kiln was a fibre kiln and cooled quickly and the new kiln cools
very slowly. Could the difference in cooling rate be a factor??. Or could
it be a diferent intensity of reduction? or could it be.....uhhh
any ideas would be greatly appreciated
and also, while i am here, i am stuck in digest mode does any body know the
command for getting back into list mode??
thanks in advance for any help forthcoming
cheers :) Ray Carlton
McMahons Creek Victoria Australia
Ron Roy on sat 2 may 98
It's the slower cooling - gives glazes more chance to recrystallize. Can
reformulate to stop that.
>----------------------------Original message----------------------------
>heres a teaser for the glaze experts..since i have started using my new
>kiln [insulating firebrick] one of my glazes is not as glossy as it used to
>be. The old kiln was a fibre kiln and cooled quickly and the new kiln cools
>very slowly. Could the difference in cooling rate be a factor??. Or could
>it be a diferent intensity of reduction? or could it be.....uhhh
>
>any ideas would be greatly appreciated
>
>and also, while i am here, i am stuck in digest mode does any body know the
>command for getting back into list mode??
>
>thanks in advance for any help forthcoming
>
>
>cheers :) Ray Carlton
>
>McMahons Creek Victoria Australia
>
>
Ron Roy
93 Pegasus trail
Scarborough Otario
Canada M1G 3N8
Phone: 416-439-2621
Fax: 416-438-7849
Web page: Home page http://digitalfire.com/education/people/ronroy.htm
paul wilmoth on sun 3 may 98
Ray,
Slow cooling promotes the opportunity for crystals to form and grow.
Crystals will lead to opacity and mattness. You answered your own
question.
regards- Paul
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David Hewitt on wed 6 may 98
In message , Ray Carlton writes
>----------------------------Original message----------------------------
>heres a teaser for the glaze experts..since i have started using my new
>kiln [insulating firebrick] one of my glazes is not as glossy as it used to
>be. The old kiln was a fibre kiln and cooled quickly and the new kiln cools
>very slowly. Could the difference in cooling rate be a factor??. Or could
>it be a diferent intensity of reduction? or could it be.....uhhh
>cheers :) Ray Carlton
>
Ray,
As others have already said, you could be right about the slower cooling
being the reason.
I do not, of course, know what controls you have on your kiln, but the
greater insulation will also give you the potential to heat up more
quickly, particularly at the upper end of the firing. I mention this
just in case the problem is arising because the glaze has not completely
gone into solution, as the effective 'soak' time has been less and hence
the result looks less shiny.
From my experience with electric kilns and when I have replaced
elements, and so obtained a faster heat up rate at the top end of the
firing, I will reach the desired indicated temperature and need to soak
for longer for the witness cones to go over and to achieve the same
glaze finish as before with the older elements.
David
--
David Hewitt
David Hewitt Pottery ,
7 Fairfield Road, Caerleon, Newport,
South Wales, NP6 1DQ, UK. Tel:- +44 (0) 1633 420647
Own Web site http://www.dhpot.demon.co.uk
IMC Web site http://digitalfire.com/education/people/hewitt.htm
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