"Tortoise is a really fun glass to play with, it can strike to a purple/grey color in the flame [I had success with using a bead roller or press to get this to happen]. Tortoise also can get some color changing properties with intense black webbing. The best reaction was with silver leaf, it fumed the glass to a yellow and pink color. With the purple frit it changed to a creamy yellow color [shown here: the purple frit is Zimmerman 851]. A great color to play and experiment with."
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Lara Lutrick
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