Not necessarily as my cherry mixes start out clear when I make them, then after a few days they start getting a light red tint to them.
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Changing color is a very natural part of the steep process. Some go pink some go all different shades of amber while others go dark brown. It all depends on what your making. Nicotine itself will also amber with time. The change of color is the chemical reaction of the flavoring reacting with the nicotine and some of it is caused by nicotine oxidazion.