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Latest comment: 11 years ago1 comment1 person in discussion
'Subtitution' of what? 'Concentration' of what?
UV light does not exist.
It should be UV radiation.
(light is the part that is visible by the human eye, and thus excludes UV radiation) — Preceding unsigned comment added by Asterladybug (talk • contribs) 21:43, 30 October 2012 (UTC)
--Asterladybug (talk) 21:46, 30 October 2012 (UTC)Reply
