Dark edge around white frit

Started by Tonyb, January 20, 2014, 11:57:30 PM

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Zeldazog

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)

Shirley

No, it's not ivory. It's very white. The one that is more ivory is Val Cox Cashmere White.
Val Cox Frit - Thai and Bali Silver 

Dietmar

Quote from: Tonyb on January 21, 2014, 01:28:21 PMIt 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.