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Dont use foil it causes hotspots from any creases in it. I would use nothing if not the right thing ,its not worth harming the plant but the emergency blanket is a good option and its cheap and easy to come by. Just visit any department store with a outdoors section they go for a couple bucks.

I'd say that you dont have to start worrying unless you see that a majority of them are changing. Sometimes i notice with mine some of the first hairs that appear turn way before the rest. Also depending on how far into flower you are helps to figure out, later in not bad early in raise concern.