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View Full Version : cadmium colors in contact with lead based glasses


Pete VanderLaan
12-18-2016, 03:44 PM
I'll start his with this simple observation: If anyone ever wondered why Cadmium yellows and reds turn a sort of ugly brown in contact with a lead based color, they do not like each other. Cad sels are not made using lead. Nominally, they're Zinc/Potash glasses. It's the main reason they are so intolerant of many clear glass bodies.

Further, any cadmium glasses in the presence of copper based colors, leaded or not will turn a really dirty brown as well.

Now do what you will with this board.

Steven O'Day
12-23-2016, 12:22 AM
Fusers consider this a feature:
http://www.bullseyeglass.com/images/stories/bullseye/PDF/other_technical/reactive_potential_of_bullseye_glass.pdf

Kenny Pieper
12-23-2016, 11:28 AM
When I make cane with my stiff white that has lead in it and want to cover it with either red of a sulfur amber I have to put a layer of clear in-between or it will turn dark brown.
I am sure this will also be true if using the gaffer duro. Many colors will not work if touching.

Pete VanderLaan
12-23-2016, 01:53 PM
It's an anti-feature