[Clayart] Homemade Cone 5 and 6

Robert Harris 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
> than
> 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
> www.farmpots.com
>
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