search  current discussion  categories  kilns & firing - raku 

test 2 preserving raku finishes acrylic fails

updated fri 26 nov 99

 

edwin gould on tue 23 nov 99

Silicone grout sealer made by TILE GUARD does not effect the colors of M.
Blanding.



>I TRIED ACRYLIC SPRAY AFTER A BEAUTIFUL BLUE AND RED FROM MOLLYS BLANDING
>GLAZE; the colors disappeared. Any suggestions?
>
>

Susan Goldstein on wed 24 nov 99

Please tell us what Molleys Blanding Glaze is.

Susan

Richard Jeffery on thu 25 nov 99

Has anyone tried either Tung oil [China wood oil] or jade oil? I use the
former on wood sometimes - it's reckoned to give a better seal than Danish
or Teak oil but is expensive and quite thick/viscous. Not sure how thinning
it would affect its properties, or how it would affect colour. The latter
is used to preserve patinated finishes on metal - so presumably slowing
oxidation. Camellia oil has long been used by the Japanese on their
woodworking tools to prevent rusting - extremely thin natural oil, coats
well - so thin you can pick up a steel tool and not realise it's covered
with oil.

I am concerned by this thread - I've recently managed to get some good (i.e.
vibrant) copper matt effects on my clock faces and I don't want them to
measure months elapsed by colour loss as well as the more traditional
methods of telling the time.

I am aware of copper flashing re-oxidising fairly rapidly given the right
conditions - not this.

Question:
What are typical time scales for colour loss from copper matt?

If we can reach a consensus, I will run some tests using above oils. Don't
want to start that without some idea of when/how often to start looking for
changes though.


Regards

Richard
Bournemouth UK
Still no frosts here! [Pity really - bit of a snow addict given the chance]

PS - anyone tried WD40?

> -----Original Message-----
> From: Ceramic Arts Discussion List
> [mailto:CLAYART@LSV.UKY.EDU]On Behalf
> Of edwin gould
> Sent: 23 November 1999 17:50
> To: CLAYART@LSV.UKY.EDU
> Subject: Test 2 Preserving Raku finishes ACRYLIC FAILS
>
>
> ----------------------------Original
> message----------------------------
> Silicone grout sealer made by TILE GUARD does not effect the
> colors of M.
> Blanding.
>
>
>
> >I TRIED ACRYLIC SPRAY AFTER A BEAUTIFUL BLUE AND RED FROM
> MOLLYS BLANDING
> >GLAZE; the colors disappeared. Any suggestions?
> >
> >
>

edwin gould on thu 25 nov 99

The Molly Blanding recipe I have used is:
Bone ash---------------200 grams
Colemanite-------------500 grams
Frit 3134------------------25 grams
Nepheline Syenite---100 grams
Cobalt Carbonate------12.5 grams
Copper Carbonate----100 grams
This information came to me from PJ Allen, Wildfire Pottery in a message of
Dec. 4, 1996. He also stated:"Increase cobalt for deeper blue, or add a
little manganese to encourage purples. Like most raku glazes, the higher it
is fired, the glossier the surface."

Hope this helps you.

All the best.

Marvin Flowerman (marvpots@aol.com)

-----Original Message-----
From: Susan Goldstein
To: CLAYART@LSV.UKY.EDU
Date: Wednesday, November 24, 1999 8:52 AM
Subject: Re: Test 2 Preserving Raku finishes ACRYLIC FAILS


>----------------------------Original message----------------------------
>Please tell us what Molleys Blanding Glaze is.
>
>Susan