[Clayart] About making a red glaze work again.

[David Finkelnburg]

Hi Roxanne,
   I may have missed something so I have to ask, are you using an iron red?
If so, phosphorus is important.
   Bone ash and Tri-cal have essentially the same weight percent
phosphorous so if you replace one with the other on a gram for gram basis
you will have the same amount of phosphorous in your recipe. Tri-cal will
give you slightly more calcium, though. Adjusting the amount of whiting in
the recipe using a good glaze calculation program may be useful.
   Regards,
            Dave Finkelnburg

On Sat, Jul 27, 2024, 5:53 AM Roxanne Hunnicutt via Clayart <
clayart at lists.clayartforum.com> wrote:

> My red stopped working before Covid. I still have not managed with
> different red iron oxides to get it again. Now we have contacted Stephen
> Hill and learned his newest revision. But I’m confused by  this:
> Tri-calcium phosphate is the same as bone ash?
>
> Is that so? Or is it a substitution? I bought some Tri-calcium phosphate
> for the garden. What is best?
>
> Help me get my red back.
>
> Rox
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: <
> https://lists.clayartforum.com/pipermail/clayart/attachments/20240726/21080ee4/attachment.htm
> >
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.clayartforum.com/pipermail/clayart/attachments/20240727/ea4461e1/attachment.htm>