What is the story behind the joker on batman why does he wear makeup

After committing theft, which Batman thwarts, he falls into a vat of chemical waste & emerges with bleached white skin, red lips, green hair & a permanent grin

Tags: white skinvattheftjokercosmetics 
Wednesday, February 01 2012

Source: http://en.wikipedia.org/wiki/Joker_(comics)

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