Dan Saultman on thu 18 sep 97
Hi Everyone.
Does anyone have a recipe for a cone 06-04 white slip that I can spray
on wet terracotta. I would like to spray it on and then comb through
it.
Thanks for your help
Dan Saultman in Colorado, where it's sunny and mild 70's.
Vince Pitelka on fri 19 sep 97
>Does anyone have a recipe for a cone 06-04 white slip that I can spray
>on wet terracotta. I would like to spray it on and then comb through
>it.
Dan -
This is a repeat of a post I made six or eight months ago. I hope it meets
your needs.
The following is an all-temperature slip recipe which I have used for ages.
It is technically a cone-ten formula, so at low temps it is by no means a
vitreous slip, but it has always worked great for me in all applications.
If you use it thickly (slip-trailing, feather-combing, marbling) in
high-fire reduction firing with over 5% iron added, reduce the potash
feldspar in the base slip an equivalent (% of the total dry batch weight)
amount to avoid bloating and blistering of the slip.
ALL-TEMPERATURE WHITE BASE SLIP:
EPK -------------------- 34
Ball Clay --------------- 20
Potash Feldspar ---- 27
Silica -------------------- 19
Total -------------------- 100
Plus:
Zircopax ------------------ 8
SOME SUGGESTED COLORANT ADDITIVES
Tan/Gray (ox/reduc) -- 5% Rutile
Light Green -------------- 1% Chrome Oxide
Light Blue-Green ------- 1% Chrome Oxide, 1/2% Cobalt Carbonate
Dark Blue-Green ------- 4% Chrome Oxide, 3% Cobalt Carbonate
Medium Green ---------- 7% Chrome Oxide
Sky-Blue ------------------ 1/2% Cobalt Carbonate
Medium Blue ------------ 2% Cobalt Carbonate
Dark Blue ----------------- 5% Cobalt Carbonate
Light Brown -------------- 3% R.I.O. (Red Iron Oxide)
Medium Brown --------- 7% R.I.O.
Dark Brown ------------- 12% R.I.O.
Black ---------------------- 8% R.I.O., 5% Manganese Diox., 5%
Cobalt Carb.
If you are using slips for polychrome painting, these percentages
may not give intense enough colors. In that case you can boost the
opacifier in the base batch to 12%, and double or even triple the above
oxide percentages. Keep in mind that such powerfully-tinted slips would
only be appropriate for thin application, as in polychrome slip-painting.
A wider palette of slip colors may of couse be achieved with Mason stains.
If you want really intense colors at low-fire temperatures you may have to
use as much as 30% stain, but, especially at high-fire, very acceptable
colors can be achieved with additions of from one to fifteen percent.
- Vince
Vince Pitelka - vpitelka@DeKalb.net
Home 615/597-5376, work 615/597-6801, fax 615/597-6803
Appalachian Center for Crafts
1560 Craft Center Drive, Smithville TN 37166
| |
|
