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further testing is recommended
Color variations common from minty-pastel to vibrant yellow-green
This sulfur-bearing glass may react with gold-bearing lead (001311
This type of contamination is impermanent and may be burned out/fired out over the course of subsequent firings
Putty should be kneaded until warm/body temp
Stained Glass Whiting Powder Size:1.5 lb Tub further testing is recommendedA finely ground, naturally occurring Calcium Carbonate, 98% pure. Balance of components, silica or magnesium. As used in better grade glazing compounds or for cleanup after glazing. Instructions Leaded Glass Cleanup: Sprinkle dry over entire surface. Rub with soft cloth or stiff soft bristled brush. Wipe Clean. If putty is too soft: Take golf ball sized putty in palm of hand and knead by rolling back and forth into a ball. Putty should be kneaded