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'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]
