Returning to the more orthodox version of the cannabinoid biosynthesis, the role of ultraviolet light should be reemphasized.
Low-density polythene is also often protected by carbon black which absorbs the ultraviolet light which causes free radical production (see p.54 ).
Skin will be tested by shining ultraviolet light to limited areas and by taking tiny skin samples.
This protects us from harmful ultraviolet light and x rays from solar magnetic storms.
Artificial ultraviolet light is used to treat skin diseases like psoriasis and is called phototherapy.