Last year we visited Whitby on the north-east coast of England where we bought a small silver ring with a jet-black stone in it. I wondered what jet would like like in Ultra-Violet Fluorescence and, although it didn’t glow brightly, it did change colour and show some detail.
This first pair of images, displayed using a comparison slider, shows the ring under room lighting and UV fluorescence:
If you look carefully the jet, which now shows as brown, has faint striations running from upper left to lower right. I thought I would then try blending the two images together to see what, if any difference it made:
This hasn’t made any difference to the visibility of the striations. Nothing ventured, nothing gained!