Vintage HEISEY Glass Sugar & Creamer Crystalite Set

Vintage HEISEY Glass Sugar & Creamer Crystalite Set -Fantastic Condition!-No Chips or Cracks -Maker: Heisey Glass Company.-Stamped: on Bottom -See Photos for Measurements -When uranium is added to glass, it can produce a clear or translucent appearance while still possessing the ability to fluoresce under ultraviolet light.-Uranium Ghost Glowers:For every rule there is an exception. While nearly all uranium glass will glow brightly under 395nm UV light every once in a while you may come across a piece that really only seems to react under 365nm.-What and How to tell the difference between manganese glass.* Manganese Glass glows under 365nm, with a smooth Yellowish-Green Glow.* Uranium Glass glows in both 365 and 395nm* If it glows a Bright Green under 365nm it's Uranium Glass. If it glows a Soft Yellow Green then it is Manganese Glass. Perfect for everyday use. superior materials and excellent craftsmanship ensure long-lasting durability.