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Where Did This Yellowy Colour Come From?


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Going through my normal glaze frustrations - I added 3.5% titanium dioixde to a paleish grey glaze and it's gone yellowey/ochre colour.

 

Why?

 

I'd expected to get lovely blue/grey with titanium sparkles/slight crystal effect!

 

Clay is a pure white stoneware fired at Orton cone 7 and a half.

 

Recipe is...

 

Soda Feldspar 70

Bentonite 3

Lith Carb 1

Dolomite 7

Zinc Ox 5

Quartz 12

 

Cobalt Ox                .075

Chrome Ox              .075

Nickel Ox                 .05

 

Titanium Dioxide    3.5

 

The rim (which has gone bluey) was dipped again in same glaze + 10% Gillespie Borate.

 

 

post-61816-0-66733400-1494939561_thumb.jpg

post-61816-0-66733400-1494939561_thumb.jpg

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For bluish, I would have tried replacing the titanium with zirconium, of 50/50 zirconium and tin.

 

Yet you may not want to use the tin, as you are including chrome in you glaze. Could cause pink flashing.

 

 

best,

Pres

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