[Clayart] Cone 6 clay

[wschran at twc.com]

Think due to sulfur content.
William Schran
wschran at twc.com
703-505-1617

---- Rod Haaland <rod.haaland at gmail.com> wrote: 
> Why no goldart?

On Wed, Aug 22, 2018 at 12:41 PM Douglas Fur <23drb50 at gmail.com> wrote:

> Based on my tests, I would build an orange clay body starting with these
> parameters.
>
> Hawthorne FC yes
> Lincoln FC  no
> OM4 only if needed {bentonite might be a better choice}
> Goldart not so much
> Tri-calcium phosphate yes
> Ocher  yes
> Rutile (I saw negligible effect in one series and didn't pursue it. It
> might enhance the                      color produced by ocher.)
> Gerstley borate (theoretically a clay with boron and phosphorus in the
> glassy matrix                        would be stronger.) Interesting but
> needs work. Can produce a "cakey" texture                    but this can
> be offset by adding vinegar.
>
> If I were starting  this morning my guess would be
> 80 Hawthorne
> 10 grog
>  7  TCP
>  3  ocher
>
> Duff
> Seola Creek
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-- 
Rod Haaland
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