Hello. I have my DIY nicotine in my amber glass bottle, strength is 17 mg/ml in VG and the last time I put it in the fridge the color of the liquid was clear and now after a while is a little bit reddish or pinkish and the taste of liquid is very peppery… Is something wrong with this nicotine or is it just oxidized? Does nicotine became more harmful when oxidized? I diluted this nicotine to 5 mg/ml and is fine for vaping, vapour is not of peppery taste. Thank you for the answers in advance.