[Clayart] Homemade Cone 5 and 6
robertgharris at gmail.com
Tue Apr 12 16:37:32 UTC 2022
I imagine the low cones are mostly fritted.
On Tue, 12 Apr 2022 at 05:13, David Hendley <farmpots at eastex.net> wrote:
> On 4/11/2022 10:07 AM, ronroy at ca.inter.net wrote:
> > I visited the Orton cone factory way back when. I'm pretty sure they
> > were using red art clay. You will notice that the lower cones are
> > redish - like the colour of red art - so there will be iron present to
> > help melting at lower cones.
> > I was asking questions - like how do you get the same result when red
> > art is so
> > variable? They told me they made a batch, made some cones and fired
> > them next to standard cone they had lots of. If the cone did not bend
> > properly they adjusted the batch and tried again - till the batch was
> > right.
> > If red art is used make sure you get a bag and reserve it for making
> > cones.
> > RR
> Yes, I use Redart clay for for my cone 06 cones. Since Orton cones are
> red in that
> temperature range I decided to make mine red as well, by using Redart.
> My formula and recipe is:
> CaO .65
> MgO .07
> K2O .11
> Na2O .17
> Fe2O3 .08
> B2O3 .72
> Al2O3 .31
> SiO2 2.22
> Redart clay 48.5
> Custer feldspar 9.0
> Gerstley borate 28.0
> whiting 10.5
> total 96.0
> I have been using the same batch of Redart (not just for cones) for more
> 30 years, since I bought 4 bags in about 1990!
> So, what ingredients are used for really low temperature cones?
> When you get down to the luster firing range, cones 018, 019, 020,
> the cones are white again, as are high fire cones.....
> David Hendley
> david at farmpots.com
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Clayart