Antique, likely Imperial glass, lead crystal. Lead glows blue under 365nm uv. Fostoria slag glass cadmium under 365nm uv flashlight; Cone shaped piece of glass from Fostoria factory slag glows with high cadmium content; Imperial vase cadmium bottom, grapes were more icy blue to naked eye but showed blue-violet in camera lens, then more cadmium then just the green light on the flashlight then in reality icy blue at top; Fostoria clear coin glass candle holder glowed with both 365nm & 395nm with manganese & true uranium. This is vivid 365nm uv; Fostoria clear bowl shows beautiful blue with the faint ring of uranium around it and in thicker parts
