1890s Amethyst Glass compote

This beautiful Early American Pattern Glass (EAPG) piece was manufactured by Bryce, Higbee & Company. It is their "New Crescent" pattern (introduced circa 1896-1898), which collectors also widely refer to as "Diamond Point Discs". Regarding its composition and glow, you are dealing with a fascinating quirk of antique glassmaking! The faint amethyst tint is likely "solarized" glass. Prior to World War I, manufacturers added manganese as a decolorizer to make pressed glass look crystal clear. When exposed to sunlight (UV rays) over decades, the manganese oxidizes and turns a distinct light purple or lavender shade. Under a 365nm UV blacklight, manganese gives off a dull, pale greenish-yellow or peachy glow, which is often mistaken for uranium. True uranium content usually colors the glass yellow-green ("vaseline") or bright green under natural light and produces an unmistakable, vivid bright green fluorescence under UV. This antique dish is in good vintage condition and glows slightly under UV light. However the bottom rim is slightly uneven. The rim feels consistent all the way around, therefore it is not known if this is some sort of damage or a manufacturing defect. It is not noticeable and feels mostly smooth, not jagged. It is sold as is and priced accordingly.