Roger Graham on wed 2 apr 03
A would-be customer came in this week with a small terracotta pot, unglazed,
two handles, size of a coffee mug. Little escutcheon/badge on one side with
first names of bride and groom, and a date. Souvenir from a wedding, where
every guest was given one of these .
Red terracotta, wiped over with a smear of white slip then sponged back to
leave just a delicate trace, but well defined white lettering where the
names are. The customer, herself a bride-to-be, wants to use this idea
again for her own wedding some months away.
No problem making the pot, or the little badge, or the lettering. But I
haven't ever done anything with the white-over-terracotta effect. There must
be good folk on Clayart who've been there, done that. So tell me please,
how thick or how thin do you prefer for the white slip? Like cream? Like
milk?
And at what stage do you prefer to apply the thin wash of slip? When the pot
is leather hard? Bone dry? Or in between?
And what works best for putting it on? Soft bristle brush? Or a sponge? Or
something else?
And, do you prefer to wipe it off again straight away? Or let it dry a bit
first?
Any other wise advice? You can save me from having to re-invent the wheel.
Roger Graham, near Gerringong, Australia
http://members.optusnet.com.au/~rogergraham
Marcia Selsor on wed 2 apr 03
Roger,
Two ways to do it.
I have used both, but for different affects.
For what you want I would suggest 50% kaolin and 50 frit 3110
as an underglaze base. You could add a little zircopax to whitten but it
may be white enough without it.
Bisque the TC and then put this on, and wipe off. Fire again.
Otherwise the red TC may smear and smudge the white color.
The other method is apply a ball clay or kaolin terra sig and gently
wipe it off the dried TC.
Best wishes,
marcia selsor
Roger Graham wrote:
> A would-be customer came in this week with a small terracotta pot, unglazed,
> two handles, size of a coffee mug. Little escutcheon/badge on one side with
> first names of bride and groom, and a date. Souvenir from a wedding, where
> every guest was given one of these .
>
> Red terracotta, wiped over with a smear of white slip then sponged back to
> leave just a delicate trace, but well defined white lettering where the
> names are. The customer, herself a bride-to-be, wants to use this idea
> again for her own wedding some months away.
>
> No problem making the pot, or the little badge, or the lettering. But I
> haven't ever done anything with the white-over-terracotta effect. There must
> be good folk on Clayart who've been there, done that. So tell me please,
> how thick or how thin do you prefer for the white slip? Like cream? Like
> milk?
>
> And at what stage do you prefer to apply the thin wash of slip? When the pot
> is leather hard? Bone dry? Or in between?
>
> And what works best for putting it on? Soft bristle brush? Or a sponge? Or
> something else?
>
> And, do you prefer to wipe it off again straight away? Or let it dry a bit
> first?
>
> Any other wise advice? You can save me from having to re-invent the wheel.
>
> Roger Graham, near Gerringong, Australia
>
> http://members.optusnet.com.au/~rogergraham
>
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--
Tuscany in 2003
http://home.attbi.com/~m.selsor/Tuscany2003.html
Vince Pitelka on wed 2 apr 03
> And at what stage do you prefer to apply the thin wash of slip? When the
pot
> is leather hard? Bone dry? Or in between?
Roger -
The effect you refer to is usually done with an engobe applied on
bisque-ware. Then there is no chance of disrupting the clay surface with
the sponge. If you try to do this on a leather-hard or even bone-dry clay
surface the clay itself is always going to smear a bit.
An engobe is just a slip formulated to be applied to bone-dry or
bisque-fired clay. There are lots of recipes available, and you can find
information in the archives.
Best wishes -
- Vince
Vince Pitelka
Appalachian Center for Craft
Tennessee Technological University
1560 Craft Center Drive, Smithville TN 37166
Home - vpitelka@dtccom.net
615/597-5376
Office - wpitelka@tntech.edu
615/597-6801 x111, FAX 615/597-6803
http://iweb.tntech.edu/wpitelka/
Brenda Beeley on fri 4 apr 03
Dear Roger,
I've used cone 6 white glaze, cone 06 matte white glaze and assorted other
glazes on terra cotta. I applied it with a brush on bone dry green ware,
let it dry then damp sponged it off. I've also applied it on a large
bisqued piece that I dipped and poured and damp sponged off the high
places. I've fired my pieces anywhere from Cone 06 to Cone 1.
Good luck,
Brenda
>Subject: Need advice: White slip over terracotta
>
>A would-be customer came in this week with a small terracotta pot, unglazed,
>two handles, size of a coffee mug. Little escutcheon/badge on one side with
>first names of bride and groom, and a date. Souvenir from a wedding, where
>every guest was given one of these .
>
>Red terracotta, wiped over with a smear of white slip then sponged back to
>leave just a delicate trace, but well defined white lettering where the
>names are. The customer, herself a bride-to-be, wants to use this idea
>again for her own wedding some months away.
>
>No problem making the pot, or the little badge, or the lettering. But I
>haven't ever done anything with the white-over-terracotta effect. There must
>be good folk on Clayart who've been there, done that. So tell me please,
>how thick or how thin do you prefer for the white slip? Like cream? Like
>milk?
>
>And at what stage do you prefer to apply the thin wash of slip? When the pot
>is leather hard? Bone dry? Or in between?
>
>And what works best for putting it on? Soft bristle brush? Or a sponge? Or
>something else?
>
>And, do you prefer to wipe it off again straight away? Or let it dry a bit
>first?
>
>Any other wise advice? You can save me from having to re-invent the wheel.
>
>Roger Graham, near Gerringong, Australia
>
>http://members.optusnet.com.au/~rogergraham
>
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