When fusing black dichroic glass is it necessary to place clear glass on top of it? Using spectrum system 96.?

I work with soft glass, but here is what I found for dichroic. I hope it helps.

http://www.ugotglass.com/dichroic_cabs.htm

http://www.system96.com/Pages/KnowledegBase1.html

http://www.system96.com/Pages/FiringGuideF.html

Good Luck!

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