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Author Topic: Dark edge around white frit  (Read 4955 times)
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Zeldazog
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« Reply #15 on: January 22, 2014, 04:18:44 AM »

I agree with Janie

Going be Bullseye glass, both Dense white opal and translucent white opal are lead bearing glasses, whereas French vanilla (the B/E version of reactive ivory) is a sulphur bearing glass, as are all of the rich strong reds - therefore you wouldn't get a reaction between ivory and red (assuming they use similar sorts of base formulas)
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Shirley
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« Reply #16 on: January 22, 2014, 04:35:19 AM »

No, it's not ivory. It's very white. The one that is more ivory is Val Cox Cashmere White.
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Val Cox Frit - Thai and Bali Silver 
Dietmar
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« Reply #17 on: March 24, 2020, 03:11:12 AM »

It if effetre - 591432 Opaque Medium Red with Enamel White frit.
Here we go...
The red contains a cadmium compound with sulfur, selenium or tellurium as the colorant. The enamel white contains lead as a majour ingreadient to get a lower melting temperature. The lead causes a very low surface tension and makes the enamel "creep" over the bead. Finally, there is a reaction between lead an sulfur (...) that gives black lead sulfide.

If you use Effetre white (the regular one) you'll get white dots with a sharp edge. Ivoury (both) works simillar, but makes less defined edges on the dots and doesn't get the grey to black halos.
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