Does anyone have a good copper matt Raku glaze and some tips for firing to get the rainbow colors.
Copper Raku Matt Glaze
Posted 09 September 2013 - 12:44 PM
The 'Rainbow' hues can be a shifting target- they often are a function of spot reduction in the post-fire process.
However, I've had good luck with a range of the copper sand glazes.
The thing with many of the 'Matte' glazes is that they're inherently low in silica, and the colors can be quite unstable. There's a really good article on Digital Fire that you may want to check out... and it includes a number of glazes.
The reality is that you'll need to experiment to find the conditions that work with your system, however...
Posted 09 September 2013 - 03:46 PM
Either we're having a little terminological confusion, or I am very very confused.
[I'll admit from the start that I haven't the faintest idea what a copper sand glaze
looks like. AFAIK it's not a term we use on this side of the pond, so I've never
knowingly seen one in the flesh.]
To me copper mattes look like highly coloured velvet: http://tinyurl.com/ngl359b
requiring both fairly strong reduction and judicious re-oxidation.
... and in John Weeldon's case contain something like 10% hi alk frit and 90% CuO.
Not so much an unbalanced glaze as slightly sticky copper oxide.
On the other hand the glazes in Tom Buck's excellent paper http://tinyurl.com/omq3p8c
have always looked to me (on paper) like copper glazes that flash, and in the the photos
appear shiny rather than velvet-matte. http://digitalfire.c.../xujfudusij.jpg
Do we agree that these are two distinct styles of "glaze"?
Posted 09 September 2013 - 04:15 PM
Fair enough. I thought you were looking for a matte style raku glaze that could yield an 'oil on water' type of color effect.
It sounds like you're after something more specific than that though... so I'll take a step back and see if anyone else can answer.
Posted 09 September 2013 - 04:49 PM
Does anyone have a good copper matt Raku glaze
and some tips for firing to get the rainbow colors.
Maybe/perhaps. Personally, I am just about to the point were they are starting to
almost look like copper matte.
A glaze that can definitely give good results (in the hands of a master like John
Wheeldon) is 10% hi alkaline frit and 90% copper oxide plus a little glaze binder.
As to the firing and post-firing, I quote from an earlier email to a friend:
... at any point if things haven't worked refire the pot and start again.
Posted 09 September 2013 - 07:36 PM
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