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Hard Paste Porcelain Question


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#1 Chris Campbell

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Posted 20 February 2014 - 09:03 PM

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?


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#2 Marcia Selsor

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Posted 21 February 2014 - 08:49 AM

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

#3 porcelainbyAntoinette

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Posted 07 March 2014 - 12:31 AM

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.






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