Leaves turning dark purple almost black looking

Jmoney0523

Member
So I know certain things cause the leaves to turn purple but I have never seen them turn this dark before. This is an Indica plant on week seven of flowering so it’s almost done. The Trish are half milky, white, and some turning Amber so it’s only got a little bit left to go. I’m just curious why the leaves are turning such a dark color
 

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