Potter Wagoner on tue 15 oct 02
I am getting a lot of requests for the yellow formulas off list. Here
are the five most recent ones posted. (Two were not posted by me, but I
put them on this list.)
The Cushing Yellow is very very nice. Especially thin on porcelain.
I am wondering what the "Otto's Swedish Matt" is like with all this talk
of the secret formula. It came out of Richard Peeler's notebook that
Marj Peeler gave me.
All Cone 10
Peeler Yellow (St. John's)
Feldspar 1152 Custer 43
Whiting 12.8 0.5
Dolomite 409.6 15.2
Talc 83.2 3.1
Ball Clay 246.4 9.1
Flint 128 4.7
Ochre 9.6 0.4
Barium 640 (BE CAREFUL...TOXIC!) 24
Zirocpax 384 14.3%
Iron 76.8 2.8 %
Bentonite 50 2.0 %
Put it on thin in mild to medium reduction.
Can substitute Strontium for BaO
==================================================
Firey Yellow Matt Cone 10
KINGMAN FELDSPAR 50 (can sub G-200 or Custer)
EPK KAOLIN 50
DOLOMITE 25
WHITING 10
BONE ASH 8
ADD: 0.7% RED IRON OXIDE, 1.4% RUTILE
========================================================================
==
Fiery Yellow Matt (revised to give minimal silica as required by
Insight) C10
Shaner Yellow Cone10
Zircopax 920
Spar 1960
Whiting 800
Talc 160
Red Iron 160
Bone Ash 400
Bentonite 70
========================================================================
=
Otto's Swedish Mat (Waxy Yellow) Cone 10 (Barium Toxic!)
Needs a lot of reduction
Feldspar 520
Whiting 90
Zinc Oxide 80
Barium Carb 210
Ball Clay 100
Flint 30
Rutile 20
Red Iron 42
Might add benotinite
(if shivering add NY SY)
========================================================================
==
Glaze name: CUSHING YELLOW MATTE
Cone: 10
Color: yellow/orange
Testing: Tested
Surface texture: matte
Firing: Reduction
Glaze type:
Recipe: Percent Batch
Custer Feldspar 23.10 1848
Dolomite 28.30 2264
Whiting 12.90 1032
EPK 29.70 2376
Silica 6.00 480
100.00 %Total 8000 Gm Total Batch
Also add:
Red Iron Oxide 1.50 120
Comments:
Apply very thin on porcelain to get it to break yellow/orange-best on
porcelain. Nice over textured surfaces. Runs if thick, and turns a bit
greenish yellow.
Unity Formula for CUSHING YELLOW MATTE:
0.055 K2O 0.314 Al2O3 1.252 SiO2
0.023 Na2O 0.002 Fe2O3 0.002 TiO2
0.597 CaO 4.0:1 Si:Al Ratio
0.325 MgO
Percentage Analysis for CUSHING YELLOW MATTE:
46.74 % SiO2
19.90 % Al2O3
3.22 % K2O
0.89 % Na2O
20.81 % CaO
8.15 % MgO
0.20 % Fe2O3
0.10 % TiO2
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