it also depends on the bottle. i have a 30ml mr e-liq berry-a-peelin in a plastic bottle that i swear has changed for the worse and seems harsher than 4 months ago. stored in a dark cool cabinet, no UV. im going to toss it, its lil over half full tho. not worth vaping leeched plastic. Berry appealin also turned my black plastic tips white on the bottom where the liq touches, so i know it's attacking plastic. the red vision V3 tank has no frosting good sign.
i'm going to buy some blue bottles and start peeling labels and transferring my liq. i know brown is better but it looks too mediciny to me. no UV anyway in my storage area. also going to use the frig for long term storage. no kids in the house