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originally posted by: skunkape23
There are many luminescent minerals and algae.
Do a google on it, there are more than I care to type out.
Have the water analyzed if you care to kick out the money for it.
originally posted by: trifecta
CFL lights (cobalt blue) actually have a phosphorescent afterglow because they thermally burn the added mercury within the fixture. When mercury meet low pressure plasma and moisture, it produces healthy, antimicrobial UV-C light. The same stuff they use in industrial and medical sterilization.
originally posted by: CraftBuilder
It is dim, white with perhaps a tinge of blue. It reminds me of bioluminescence or the afterglow shortly after a CFL is turned off.