[Clayart] white clay leaks.
ndiaman at hotmail.com
Tue Jul 13 01:30:32 UTC 2021
Spent some time in Eastern/Central Oregon. Volcanic rocks, Obsidian all around. Perhaps the Rhyolite you harvest was impacted by the volcanic activity ages ago giving it the qualities you speak of.
North Port, Fl
Sent from my iPhone
> On Jul 12, 2021, at 8:02 PM, Hank Murrow <hmurrow at efn.org> wrote:
> Dear Folk
> The Alaskan porcelains that Stannard developed from U. of Alaska-held deposits matured in reduction between cone 8 and 9, and are transparent if held to the light, even sunlight falling on the breakfast table will do it. I have fired-examples of each of his prospected materials. The Alaska deposits, which David called Silver Fox, were not transparent if fired in oxidation, and would need cone 10 to mature properly. I had never seen that property displayed so compellingly before acquiring those pieces. It is striking to see two bowls side by side with only the firing régime different between them. Nigel Wood was struck by David's pieces when he saw them. I would send a pic of them together if the site still supported it.
> Cheers, Hank
>> On Jul 12, 2021, at 1:19 PM, Robert Harris <robertgharris at GMAIL.COM> wrote:
>> I would add to Ron's comment that not all ancient porcelain was fired very
>> hot. According to Nigel Wood there seems to be good evidence that some were
>> fired in the region of 2250F, but held there for many many hours if not
>> days. (No doubt it is probably still "Cone 10", but due to heatWORK not
>> simply heat).
>> I'd also note that the Chinese themselves do not all accept the West's
>> definition of porcelain - particularly in terms of translucency or
>> vitrification. Many of the clay bodies (particularly the Northern Song
>> bodies) would refer to what we call a white porcelaneous stoneware. (e.g.
>> (I did a quick Google search and came up with these images for example):
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