RAKU FAQ #2 Firing Copper Matt

Clay Art Pottery
Presents the Raku
and Pit Fired Work of Vicki Hardin

In my experience with copper matt I have found its not the glaze recipe as much as how it is reduced that will give you those colors.  Some people go to extensive lengths to get those purples on a consistent basis.  This includes
using oxygen and alcohol in the post firing process. This is my theory and what I found most helpful without going to the above is to fire the piece up to 1800 F. to adhere the glaze and then let it cool. to around 800. Fire up to
1100 and then reduce in newspaper. When you introduce the piece into the can you want it to just ignite the paper.  You will notice that while the piece is hotter, the flashing will move quickly.  You want to wait till the flashing has
slowed then clamp on the lid until the side of the can is only warm.  Also, if you don't get what you like, refire. And yes, the sad truth is, this glaze will fade, more so in direct light.  Also, if you don't get what you like, refire. I don't fire this any more, but used to use this glaze 400mg cop
per carbonate, 400 mg copper oxide, 200 mg Ferro 3110.  Mix in smaller quantities as is it not as responsive when stored for longer periods of time.

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