Rotting log both in natural light and under 365 nm ultraviolet (UV-A) blacklight near Krugovaya Alley in Sosnovka Park. The intense blue or blue-green glow comes from the wood itself, specifically from lignin and cellulose. The red fluorescence comes from Chlorophyll from algae/moss or Porphyrins from bacteria. St.Petersburg, Russia
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Tue 23 Sep 2025 20:15:50 - Exposure: 25 sec - Aperture: F/32. - Focal length: 100 mm - ISO 800
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Album 3754: Saint Petersburg - Lisiy Nos, Russia, September 23 - 26, 2025
