Vintage Peter Vanderlaan Handmade Iridescent Glass Vase / Bottle, Signed! Probably contains manganese which glows under 365nm black FLASHLIGHT. Please note it does not work with those under the cabinet UV light bars. Please see the last picture which shows the example of the UV flashlight that I used in the video. Very good condition with no chip no crack. Please see pictures for details and condition. Signed and dated at the base.