canyon fox Posted December 22, 2011 Report Share Posted December 22, 2011 Is Black Cobalt Oxide blue colorant or black? Thank you Link to comment Share on other sites More sharing options...
Marcia Selsor Posted December 22, 2011 Report Share Posted December 22, 2011 It makes a blue colorant just the way cobalt carbonate looks pink but will fire as a blue colorant. Marcia Link to comment Share on other sites More sharing options...
Marcia Selsor Posted December 22, 2011 Report Share Posted December 22, 2011 It makes a blue colorant just the way cobalt carbonate looks pink but will fire as a blue colorant. Marcia Link to comment Share on other sites More sharing options...
canyon fox Posted December 23, 2011 Author Report Share Posted December 23, 2011 It makes a blue colorant just the way cobalt carbonate looks pink but will fire as a blue colorant. Marcia Thank you Marcia! Link to comment Share on other sites More sharing options...
Mark C. Posted January 19, 2012 Report Share Posted January 19, 2012 The oxide is about almost twice as strong as cobalt carbonate-if I recall its like 1 1/2 times as strong for same results Mark Link to comment Share on other sites More sharing options...
Lucille Oka Posted January 19, 2012 Report Share Posted January 19, 2012 Also the Cobalts 'spit' on other vessels in the kiln. Link to comment Share on other sites More sharing options...
neilestrick Posted January 19, 2012 Report Share Posted January 19, 2012 Also the Cobalts 'spit' on other vessels in the kiln. Cobalt is know to fume out of a glaze during firing and leave blushes on the pots next to them, or even a ring of blue on the kiln wash on the shelf. Depends on the glaze and percentage of cobalt in it. Link to comment Share on other sites More sharing options...
neilestrick Posted January 19, 2012 Report Share Posted January 19, 2012 The oxide is about almost twice as strong as cobalt carbonate-if I recall its like 1 1/2 times as strong for same results Mark If the recipe calls for cobalt carbonate, you can use 2/3 as much oxide. If it calls for oxide, you can use 1 1/2 times as much carbonate. Link to comment Share on other sites More sharing options...
Lucille Oka Posted January 20, 2012 Report Share Posted January 20, 2012 Also the Cobalts 'spit' on other vessels in the kiln. Cobalt is know to fume out of a glaze during firing and leave blushes on the pots next to them, or even a ring of blue on the kiln wash on the shelf. Depends on the glaze and percentage of cobalt in it. I prefer to say 'spits' due to the little dots that it can leave on neighboring ware. By the way, I like it. Link to comment Share on other sites More sharing options...
macdoodled Posted January 20, 2012 Report Share Posted January 20, 2012 it is more expensive than the other blue but more vibrant. this is just a computer shot but hope you can see the intensity of color on babu Link to comment Share on other sites More sharing options...
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