The black light test is not conclusive however for dating a piece of glass. Some, but not all American Brilliant Cut Glass also glows under the black light, with the colors ranging from a pale yellow to blue to violet. The color discrepancy is due to the specific metal oxide which is included in the glass to give it its' density necessary for the deep cuts.Īs metal oxides, especially Uranium Oxide, are expensive, the cheaper reproduction pieces, some using the same molds, do not fluoresce or glow under a black light. The Black Light gets its name from the fact that it emits short wave, high energy light that is at the far end of the Electromagnetic spectrum. The light from a normal incandescent light bulb is in the middle of t he Visible Light Spectrum, rich in the yellow tones, while a fluorescent light emits in the upper blue range.Ī black light is useful as the light waves are shorter, higher energy and are very quickly reflected by the piece, thereby creating the image of the piece "glowing". The glow of Vaseline glass and Green Depression Glass is a bright yellow green, due mainly to the content of Uranium Oxide present in the glass.Turn of the Century (1900's) Early American Pattern Glass will most often produce a soft glow under the black light. The use of a "black light" is used by many collectors of antique items, not just those of glass. Using a "Black" Light to Validate Early American Pressed Glass - Fact and Fiction
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