[Clayart] pin holes

Daphne Vega dvega at meca.edu
Sun Jul 21 13:54:12 EDT 2019


Hi Ron-
I have never thought about reducing or oxidizing in a bisque kiln- I am
curious why it would make a difference?

Thanks-
Daphne

On Sat, Jul 6, 2019 at 1:53 PM <ronroy at ca.inter.net> wrote:

> Just a word of warning - I'm not sure downfiring would re oxidize any
> iron that would have been reduced in a fast fired bisque. I wish
> someone would do some experiments to see if that is possible.
>
> My advise for iron bearing clay would be to fire slow enough with
> enough excess oxygen present to burn off any organics present.
>
> Keep in mind that different batches of clay in any clay body can vary
> in carbon content. The best idea is to design your bisque firings to
> make sure all carbonaceous content (usually coal) is eliminated.
>
> Well maintained and working kiln vents and ducts are a good way to do
> this and save your lungs and elements at the same time.
>
> RR
>
>
> Quoting mel jacobson <melpots at visi.com>:
>
> > dead on david...pin holes almost always come from
> > bad bisque firing.
> >
> > most know i fire for speed and perfect body development.
> > i take everything ron says to be true.
> > so...i fast fire bisque and i hold the kiln at about 1500 on the cooling
> > cycle for about 30-50 minutes.
> > all the junk comes out.
> >
> > ron suggested that i run experiments in down firing, or holding
> > bisque firing.  it seems to work well.
> >
> > in the past i really fired slow and long for bisque.
> > in some ways. i think i get the same results by down firing, or
> > holding.
> >
> > others should try and report back.
> > my bisque ware does not `blow'd up`.
> > i fire dry pots.
> > mel
> >
> > --
> > Mel's Website:  www.melpots.com
> > CLAYART PAGE:
> > http://www.melpots.com/CLAYART.HTML
> >
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>
>
> Ron Roy
> ronroy at ca.inter.net
> Web page ronroy.net
>
>
>

-- 
www.dvegadesigns.com
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