American Brilliant Cut Glass Black Light. 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. Here is a picture of the bowl in the first posts that is a reproduction.
Virtually all American Brilliant Period cut glass fluoresces green with some yellow under black light. Notice that the UV light shows a blue color. Given the discrepancies make sure to follow up with further research to ensure cut glass authenticity.
Small lights of low wattage may only fluoresce rims and bottoms.
The specific fluorescent black light to use is the General Electric GE F15T8 Black Light Blue BLB bulb which has a relatively long wavelength of 365 nanometers nm. Get the Deals now. Early American Pattern Glass EAPG and American Brilliant Period Cut Glass ABP will also fluoresce although not always as brightly. Until the mid 1990s many cut glass reprodcutions fluoreseced pink purple or white or appeared to have no reaction.
