Chris Campbell Posted February 21, 2014 Report Share Posted February 21, 2014 I just got home from viewing a collection of Tsarist dinner wares made in the 1800's from hard paste porcelain. I noticed small ding on a platter showed up black rather than glassy as I would have expected. Is this just centuries of grime?? The person in the room was not really a porcelain person so did not have an answer. Any ideas? Link to comment Share on other sites More sharing options...
Marcia Selsor Posted February 21, 2014 Report Share Posted February 21, 2014 First, one of my favorite books is Janet Gleeson's "The Arcanum" , the discovery of hard paste porcelain fictional/historical. I think what may have caused the black in the porcelain may be a strong colorant being absorbed. Sarah Jaeger used cobalt and copper sulphate for some of her decorations. I tried it. The colorants can penetrate all the way through the porcelain to the other side of the piece. Strong stuff. Marcia Link to comment Share on other sites More sharing options...
porcelainbyAntoinette Posted March 7, 2014 Report Share Posted March 7, 2014 I agree with Marcia about this Chris. It is possibly cobalt. Cobalt is often used to make white appear whiter and if it is not very very fine, it will leave specs. Link to comment Share on other sites More sharing options...
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