Just ordered another 500 ml of 100 mg from Box Elder. They have a half price sale going, so the price is great. I've never had any problem with their nic, but I am picky about storage. I have a small refrigerator in my man-cave, and all my
juice, flavors and nic are kept stored there, out of the light and kept cold. Never had any problem with coloration or taste with the Box Elder nic.