Notes from Silvie Granatelli's workshop at NCSW 2007

TECHNICAL INFORMATION
I have included some technical information, things that are often asked about my work. I use a porcelain clay body that is designed especially for it's vertical ability while throwing.  It is very plastic, due to the apple cider vinegar in the formula.  If you choose to use this clay body you will find it fairly easy to throw.  It has its fussy qualities, like cracking handles if you don't cover the pots with plastic.

I slip cast various forms and I have included that formula as well.

The stains I use are applied to bone dry pots .  They can be applied with a spray gun, foam brush or natural fiber brush.  The temperature range for this stain formula is very broad depending on what kind of atmosphere you choose.  They work at cone 04 to cone 11.  I have used them in wood, salt and soda kilns as well as gas, oxidation and reduction.  Many colors burn out at high temperatures and reduction muddies the color.  I fire my gas kiln in a neutral atmosphere to cone 10.

Last I have included a clear glaze that works beautifully in a neutral gas atmosphere.  These formulas are a jumping off point and I hope you will experiment with them in the kind of kiln you use.  They are all designed for cone 10.

Granatelli Clear cone 9-10 ox.
F-4 Spar 40.7
Colemanite 12.75
Barium 4.25
Whiting 8.5
Flint 29
Grolleg 2.6
Tin Oxide .85
frit 3110 2
Zinc .5
*use very thin

Granatelli Porcelain
Grolleg 110lb.
Flint 47.3
K-200 or G-200 47.3
Pyrotol 15.4
Bentonite 7
*use 1/2 gallon Apple Cider Vinegar with water

Stains/Granatelli ( greenware/bone dry)
equal parts:    3110 Frit
EPK
Mason Stain
(bisque, substitute Neph Sy for EPK)

Porcelain Casting Slip
Grolleg 11lb. 8oz
Kaopaque 5lb
Tile 6 3lb 3oz
Ball Clay (OM4) 5lb
G-200 12lb 8oz
Flint 12lb. 8oz
Add 170 grams defloculent to 2.4 gallons water or 2 gallons plus 51.2 oz.