David Hewitt on wed 3 apr 02
David,
Would you be willing to forward this reply to Clayart?
Cheers,
Mike.
Dear Cor Duijnker,
David Hewitt was kind enough to forward your question on to me and there
are a few methods that you can try to cut down on air bubbles.
1. Sometimes firing the bisque higher (or soaking) will help to remove
gases which can try to get out through in the glaze in the second
firing.
2. The most likely cause though is the CO2 evolving from the whiting.
You could try using wollastonite instead of whiting and a conversion of
the recipe came out as:
JB1 base using wollastonite to replace whiting
Soda feldspar 46.0
China clay 5.2
bentonite 2.0
Lithium carbonate 2.0
Wollastonite 20.4
Zinc oxide 5.2
Flint / quartz 14.0
Titanium dioxide 5.2
3. Applying the glaze in a slightly thinner coat and / or firing
slightly lower might help too.
Best regards,
Mike Bailey.
In message , Michael
Bailey writes
>
>----------
>From: David Hewitt
>Date: Sun, 24 Mar 2002 08:16:23 +0000
>To: "Mike Bailey (Home)"
>Subject: Air bubbles in Michael Bailey's Jun glaze JB1
>
>
>Mike,
>
>just in case you do not see this clayart message.
>
>David
>
>
>From: Cor Duijnker
>Date: Saturday, March 23, 2002 4:38 pm
>Subject: Air bubbles in Michael Bailey's Jun glaze JB1
>
>Hello,
>
>I want to use the beautiful Michael Bailey's glaze JB1. Cone 6. ox
>There are air bubbles in my glaze and I can't get them out.
>As the glaze is from a book recipe,I assume that the glaze is well =3D
>tested.
>Is there someone with a good suggestion to get this glaze right?
>
>Cor Duijnker
>J.v.Damweg 47
>8411XB Jubbega
>0516-462746
>e-mail c.j.duijnker@chello.nl
>
>
--
Mike Bailey
--
David Hewitt
David Hewitt Pottery ,
7 Fairfield Road, Caerleon, Newport,
South Wales, NP18 3DQ, UK. Tel:- +44 (0) 1633 420647
FAX:- +44 (0) 870 1617274
Web site http://www.dhpot.demon.co.uk
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