F. VanSickle on fri 28 mar 08
grams
Hello Wally,
Can you tell us at what stage of dryness you can draw through the slip and
glaze layers?
I have done this when the slip layer is dry enough to handle but not so dry
as to flake off. I sprayed a bit of water on areas that seemed too dry.
The results were good in terms of creating the black lines I wanted to
achieve, however, the wooden tool I used left ridges on the clay surface
which interferes with the smooth surface quality of the work. I'm guessing I
used too much pressure, although it did not seem so at the time I did the
drawings.
Any advise would be appreciated,
Thanks,
Barbara
PS. Great web site!
----- Original Message -----
From: "Wally"
To:
Sent: Thursday, March 27, 2008 4:21 PM
Subject: Re: Slip for Naked Raku versus How to convert percentages into
grams
Hello Donna,
Your analysis of the weight calculation is absolutely right.
My basic slip recipe for the slip-and-glaze method of naked raku has
always been published and stated as 50 grams dry clay, 30 grams kaolin
and 20 grams flint, no idea about the origin of the misleading
percentage formula.
At home, clay used is "Terre de la Puissaye", a dark grey cone 10
French stoneware clay from the area of Limoges.
In USA, this clay can be substituted by Highwater Phoenix or Laguna
Buff 52 type WC-851, as used with great results during many workshops.
Silica (flint) equal to Quartz 200 Mesh.
Any kind of EPK for kaolin.
On top of this slip comes a glaze with 35 grams gerstley borate and 65
grams frit 3110, wellknown recipe courtesy of Bill and Kate Jacobson.
I hope this fully answers Deborah's question, and clears up the sky
for others who replied to her message.
More details about the technique can be found on my website.
Best regards,
Wally, Schoten, Belgium
www.wallyasselberghs.be
--- In clayart@yahoogroups.com, Donna Kat wrote:
>
> On Sat, 22 Mar 2008 14:22:04 -0600, Deborah Thuman
> wrote:
>
> >I'll be doing a naked raku next month. I'm sort of on my own with this
> >because my teacher isn't fond of raku. Then again, I can experiment
> >like crazy because my teacher isn't fond of raku. Anyway, I've been
> >told that I have to use a special slip recipe for naked raku and NOT to
> >buy the commercial slip glaze. I've looked through the naked raku
> >archives, and I found the recipe people suggest. But.... it's in
> >percentages and not in grams. How do I convert this recipe?
> >
> >SLIP (by weight)
> >================
> >5 % CLAY : Fat French Stoneware "Limoges" clay
> >2 % QUARTZ (= flint = siliciumoxide)
> >3 % KAOLIN (EPK)
> >very important : sifting 4-5 times through fine sieve (80 or 100 mesh)
> >consistency : medium to fat milk
> >
>
>
> Given that this has to add up to 100% to make any sense then as
stated it
> has to be
> 50% clay (ball clay?)
> 20% Silica
> 30% EPK (kaolin)
>
> Now you have to decide how much slip you want. If you want 100 grams of
> dry ingredients then you would have
>
> 50 grams clay
> 20 grams silica
> 30 grams epk
>
> 1000 grams of dry ingredients would be
>
> 500 grams clay
> 200 grams silica
> 300 grams epk
>
> Basically whatever total amount of dry material you want would then be
> multiplied by
>
> .5 (for clay)
> .2 (for silica)
> .3 (for EPK)
>
> I hope that is the question you are asking. Donna
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