While early versions used mercury or lead, safety concerns led to their replacement with silver nitrate to achieve that iconic mirror finish from within. How They Are Made: A Craft of Fire and Air
The Radiance of Tradition: A Guide to Polish Mercury Glass Ornaments polish-mercury-glass-ornaments
By the late 1800s, this technique was adapted for Christmas ornaments, offering a "poor man's silver" look that was affordable yet stunningly radiant. While early versions used mercury or lead, safety