Recipe Name:  Pete's Weathered Bronze

Cone:  6-9     Color:  green bronze
Firing:  Oxidation     Surface:  Matte

Amount     Ingredient
60          Nepheline Syenite
20          Strontium Carbonate
1          Lithium Carbonate
10          Ball Clay--Old Mine #4
9          Silica

100         Total

               Additives
5          Copper Carbonate
5          Titanium Dioxide

Unity          Oxide
.047           Li2O
.334           Na2O
.106           K2O
.009           MgO
.028           CaO
.475           SrO
1.000          Total

.577           Al2O3
.003           Fe2O3

2.973           SiO2
.005           TiO2

5.2          Ratio
8.8            Exp

Comments:  Metal Marks
Hesselberth leach tested for copper and averaged 5 mg/l which he considered very stable for the amount of copper in the glaze.
Needs a full cone 6 down. Sometimes will pinhole.

Relatively high coefficient of expansion.

-----------------------------------
Calculations by GlazeMaster™
www.masteringglazes.com
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Example posted by Michele Hartung

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I tried Barbara's glaze and found the dipped glaze to be uniform and interesting with movement.  However the lightly glazed half of the same pot shows an apparent "weathered" look. The two pics are different sides of the same pot.

There has been lots of discussion re: this and pete's weathered bronze.  Is this and / or seafoam a safe glaze for food, or must I use a lilner for it ?   thank you all for your input.  cp

http://www.frogpondpottery.com/tested-glazes/mid-fire-stonewareporc...

STRONTIUM WEATHERED BRONZE 

This is a great weathered looking glaze.  The bronze goes from a clear, bright green to a brownish 

bruised green and is suited to all clay body colors, although it is best on tans. 

60% Nepheline Syenite

20% Strontium Carbonate

1% Lithium Carbonate

10% Ball Clay-Old Mine #4

9% Silica

ADD:

5.0%  Copper Carb

5.0%  Titanium Dioxide

This is a Pete Pinnell’s strontium glaze tweaked by John Hesselberth (see link above) so the stability and durability is fine.  Needles to say, the fired color of both the Seafoam and Weathered Bronze are almost identical but the 

Seafoam glaze really goes on nicer and seems to fire more evenly.

 

thank you barbara

/tips hat

cp

What is the colorant for seafoam as compared to bronze? I have a strong blue with 1% cobalt carb. and 3 % copper carb

Pete’s Seafoam Glaze ^5/6

9.6% Ferro Frit 3134

51.3% Feldspar-Kona F4

25.5% Strontium Carbonate

12% EPK

ADD:

5.0%  Copper Carb

5.0%  Titanium Dioxide

2.0%    Bentonite

 

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