The leaves of my marigolds are turning purple it look like it's infected. What do i do/can i fix it?

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Answers:
That and the effects of the severe light/temp change.

It affects the most established plants the most because there is more there to get ~shocked~ ;). If not too badly damaged they will recover but baby them, a little misting (feels good on a sunburn), keep them inside or under cover until they do and no feeding.