Answered By: Regan Brumagen
Last Updated: Feb 06, 2017     Views: 22

From Dr. Robert Brill, Research Scientist Emeritus:

We analyzed a fragment of Tiffany favrile glass.  It turned out to be a high-lead glass.  The composition was approximately 57.3% SiO2, 38.7% PbO, 3.1% K2O, + some trace elements. 

I would estimate that the index should be ~1.61.

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