Just Clay

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Materials

Recipes


 
 
TRANSMUTATION GLAZE
 
Example for 1100C
10     Feldspar                    
05     Flint                       
50     Lead Bisilicate            
10     Whiting                   
15     Zinc Oxide                   
10     Titanium dioxide          
 
This recipe comes straight from the Potter's Dictionary of Materials and Techniques. Referred to, (by me), as the Potter's Bible.
 
Translated in local materials it reads as follows:
10     GS 5515   Feldspar Potash                         
05     GS 5016   Kwarts superfijn                          
50     FR 2950   Lead Bisilicate                         
10     GS 4201   Calicium Carbonate                     
15     GS 6504   Zinc Oxide                            
10     GS 5905   Titanium Dioxide                       
Ref. numbers are from Silex.
 
This glaze picks up oxides from inside the clay body and any oxides applied to the surface of the article. The above recipe fired to 1085C has a matt finish. Can also be applied over or under other glazes prior to firing. Results can be most pleasing. However applying the glaze can be bit tricky as glaze tends to flake of prior to the firing if applied wrongly. Have been told that replacing the raw zinc with calcinated zinc alleviates this problem. Have never tried this as, over the years, I learned to handle the glaze.
 
Purely by chance I discovered that giving the unfired transmutation a coating of a clear  base glaze, resulted in a shiny streaky finish.
 
After a bit of experimenting I came up with the following recipe.
 
 
40     Transmutation glaze according to above recipe  
60     Lead/Less Transparent Glaze  (SG 1800)
 
The spectacular result in one application.
 
Right now I am back to basics where I use the (matt) transmutation glaze and applying the transparent only where I want the spectacular shiny bits.
 
In all cases flaking of the glaze during application can occur. Like when applying a second coat when the first coat is already dry.
 
I always fire to 1085C with a long soak at the end. And  as a rule all glazes are applied with a spray gun.
 


 


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