Vape liquid turns brown mainly due to oxidation, a natural chemical reaction that occurs when nicotine, flavor, PG, VG, and oxygen interact, particularly when shaken or with higher nicotine levels.
To slow down oxidation and preserve the original color of vape juice, store it in a cool, dry place like a cabinet or drawer.
Using dark glass bottles instead of clear plastic can further protect the juice by blocking harmful UV rays and locking in flavor.
Handle vape juice bottles carefully, and when mixing, gently tilt the bottle without excessive shaking.
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