I installed some carpet tiles in my basement over a concrete floor (not sealed). I had to replace a few due to a now departed cat who got very sick right at the end and vomited and urinated in several spots. While checking for cat urine in the existing carpet tiles, I noticed that some of the fibers fluoresced orange. It seemed to be somewhat regular distribution, not super-prevalent, but definitely noticeable. Now, after laying down the replacement, I had to check again, and the new carpet tiles do not fluoresce at all. Nothing. The tiles are from the same manufacturer, and are the same style and color/pattern.
After comparing the two different lots of carpet tiles, the original tiles appear the same as the new tiles under regular light, but appear lighter in general than the new ones under UV light.
What could cause the fluorescence in general, and the orange fibers specifically? Is this something I should be concerned about?
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The fact that something fluoresces is not something that should alarm you. It's not like radioactivity. It's likely that the dye used for the orange happens to fluoresce. Many dyes, minerals, chemicals etc. will display fluorescence. Go out to a gravel pile with your lamp and see what else lights up.