[Clayart] Low-fire slip or engobe recipe for bone-dry clay

[L TURNER]

Why not make a slip from a grogless Laguna white clay in the same firing
range as the R2 for your surface coating.  Maybe add some gerstley borate
to generate additional melt.

lt

On Thu, May 31, 2018 at 10:01 PM, Snail Scott <claywork at flying-snail.com>
wrote:

>
> > On May 31, 2018, at 10:33 AM, Tammy L. Lynn <tammylynn30 at gmail.com>
> wrote:
> > ...I am firing Laguna's R2 terracotta to 02 and I'd really like to
> > apply a white layer to the bone-dry pieces...Does anyone have a
> suggestion for a slip or engobe
> > recipe?  I'm looking for a thin opaque layer but it's okay if a little of
> > the red clay body shows through…
>
> Tammy-
>
> For white slip on bone-dry, I generally use the dry ^5 B-Mix slip base
> with 10-15% zircopax added. It’s probably a little refractory for ^02,
> though, especially with all that zirconium, so you might want to add some
> flux - maybe 10-15% gerstley borate or a frit?   My usual engobe recipe,
> which works pretty well on greenware, is an old Richard Zakin recipe
> (Ontario Engobe) from one of his books…I’ll have to check the exact recipe
> tomorrow in my studio. I use it in the ^4-6 range, but I often add extra
> flux to tweak the vitrification levels or offset refractory colorants, and
> you may find frit 3124 to be useful in bringing it down to ^02. (I know you
> don’t want it fully vitrified, but you won’t want it dusty, either.) Just
> guessing about the 3124, though. I’m not sure what the optimum flux for
> that temperature range is, since I seldom work lower than ^2, but perhaps
> someone else can offer input?
>
> I have obligations all day tomorrow, but i will try to find a better
> recipe for you on Saturday.
>
>
> Snail Scott
> claywork at flying-snail.com
> www.snailscott.com
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