James Bowen on wed 20 feb 02
The transparent/clear glaze we have been using for cone 10 R
firings turns iron bearing clays gray. It works fine on
white clay. I believe it is because it is 20% whiting and
the calcium is bleaching the iron. Does anyone have a recipe
that allows the actual color of the clay to come through or
should I be using a recipe that contains iron oxide?
Stay Centered
James Bowen
Boyero CO
jbowen43@yahoo.com
jbowen43@plains.net
Paul Herman on wed 20 feb 02
Hi James,
I think the grey you speak of IS the "actual color" of your clay when it
is cooled in an oxygen free environment, ie. sealed under a glaze. That
nice brown color of your stoneware clay developes in the cooling cycle.
Do a draw tile when you turn off the kiln and you will see.
Best,
Paul in Doyle
----------
>From: James Bowen
>To: CLAYART@LSV.CERAMICS.ORG
>Subject: cone 10 transparent/clear glaze recipe needed
>Date: Wed, Feb 20, 2002, 3:13 PM
>
> The transparent/clear glaze we have been using for cone 10 R
> firings turns iron bearing clays gray. It works fine on
> white clay. I believe it is because it is 20% whiting and
> the calcium is bleaching the iron. Does anyone have a recipe
> that allows the actual color of the clay to come through or
> should I be using a recipe that contains iron oxide?
>
>
>
> Stay Centered
> James Bowen
> Boyero CO
Ron Roy on sun 24 feb 02
The colour is the iron bearing clay under the glaze - as someone else
pointed out.
If you break a piece of reduced iron bearing clay you will see grey or even
black clay inside - depending on the amount of iron.
If you want the clay under that glaze to be white you have to use a white slip.
RR
>The transparent/clear glaze we have been using for cone 10 R
>firings turns iron bearing clays gray. It works fine on
>white clay. I believe it is because it is 20% whiting and
>the calcium is bleaching the iron. Does anyone have a recipe
>that allows the actual color of the clay to come through or
>should I be using a recipe that contains iron oxide?
>
>
>
>Stay Centered
>James Bowen
>Boyero CO
>jbowen43@yahoo.com
>jbowen43@plains.net
Ron Roy
RR# 4
15084 Little Lake Rd..
Brighton,
Ontario, Canada
KOK 1H0
Residence 613-475-9544
Studio 613-475-3715
Fax 613-475-3513
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