Talk:Fluorescence

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NADH fluorescence

NADH fluoresces in the visible range upon excitation in the UV range but ONLY when the tissue is in the reduced state. NADH is crucial to life so I hope that the Editors will get that information out to the Fluorescence article. Richard8081 (talk) 18:42, 25 September 2020 (UTC)

Commonly found objects that are fluorescent.

This is not an exhaustive list, but if you are looking to demonstrate fluorescence here are a few things that you can try.

- White paper. Commercial white paper has a whitener in it that fluoresces bright blue.

- Clothes. Most detergents have whiteners that fluoresce bright blue, so most clothes will, too.

- White plastics. Again, these contain fluoro whiteners.

- Brightly coloured dyes. Some of these are also fluorescent. Some brightly coloured plastics will fluoresce, generally the same colour that they reflect. Bright yellow plastics are the most commonly fluorescent, generally yellow or yellow-green. Same for brightly coloured felt tipped pens and similar liquid writing implements.

- Transparent plastics. If you take a piece of plastic out in the sunlight and it appears faintly blue or puprle at the edges, chances are that it will fluoresce the same colour.

- Some gemstones. The fluoro colour might not be the same as the white light colour. Even colourless gemstones like diamonds may fluoresce. Whether it does or not does not seem to influence the value of the gemstone.

- Some fungi and bacteria. I dont know whether dead ones do.

- "Fluorescent" paints. Note that some brightly coloured paints are sold as this, but are not. This is very variable. Also note that the fluoro colour may not be the same as the white light colour.

- Phosphorescent items. Many of these will fluoresce the same colour as they phosphoresce.

- Fluorescent light tubes. It may or may not be obvious, but the coating on the inside of these will fluoresce if illuminated by an outside UV lamp. Even if the tube is "dead".

- "Security" items. Things such as credit cards, other ID cards, paper/polymer currency, passports, bank cheques, etc, will often incorporate a fluorescent security feature that is invisible or very hard to see in ordinary light. Obviously, to make them more difficult to counterfeit. For example, The word "VISA" in the eponymous card has a large 'V' through the "IS" in its name.

- Bone and teeth are moderately fluorescent, nails and feathers less so. "Viewer discretion is advised" LOL.

2001:8003:E490:7D01:D02E:1079:897E:B7EE (talk) 09:56, 24 March 2023 (UTC)