UV Reactive Manganese Hoffman Reproduction Designed by Frantisek Pazourek for Schlevogt Small Harvest Grape Yellow Vase Ingrid Collection #72

Size: 5” tall

Design circa 1934, however this is a reproduction by Heinrich Hoffman

No cracks, one small shallow chip present on the bottom of base.

High Content Managanese Reactive Under 395nm*

Manganese is one of the oldest glass additives and was used in small quantities to de-colorize (remove the green tint from glass to make clear) and in higher contents to colorize glass. Manganese can be found in nearly all colors of glass, especially amethyst and turquoise blue glass. Manganese fluoresces green under 365nm UV light, often being confused with Uranium.

High Content Manganese Glass: For every rule there is an exception. While most glass that contains manganese will not fluoresce under a 395nm UV light, some pieces contain a particularly high manganese content which will react under 395nm. Do not be fooled into mistaking this for Uranium Glass, it is not, and can be distinguished by the lack of radioactivity (when tested with a geiger counter) and the subtle differences in color.

*PLEASE NOTE: Color of glass and glow may vary slightly from photographs due to variations in screen hues and nm of black light used to produce glow. The type of Ultraviolet light and the color of visible light is determined by its wavelength. The unit of measurement for light wavelengths is the nanometer (nm). Ultraviolet light is generally considered to be from 200 nm to 400 nm.