This Arts and Crafts Inverted Dome from 1900 has a combination
of complimentary opalescent iridescent glass. The darker Amber
is like Tiffany's
Favrile Glass.
It is both opalescent and iridescent. When you see the bulbs location
through the glass there is a iridescence as well as opalescence in that area.
The lighter color is Blue to Amber opalescent glass. When the bulb is at the right level of illumination everything looks Amber.
Wonderful Dining room Fixture. 22 inch diameter x 36 inches drop.