Why are some bottles of the same fragrance darker/different colour than others?Updated 2 years ago

Many fragrance oils contain ingredients that react to air and light, causing them to darken or change colour as they oxidize. This should not affect the fragrance potency or scent itself, although it may affect the colour of your candles if you are not adding colour to them. The best way to store your fragrance oil is in a cool, dark location to minimize oxidization.