This is likely due to steeping, which occurs when the nicotine in vape juice oxidizes. Additionally, the nicotine in your e-juice reacts with the flavorings, giving the liquid a deeper hue. The longer a juice steeps, the darker it will become.
Steeping is normal, so there is no need to be concerned with the change in color. In fact, many vapers find that the flavor tends to be better once the liquid has had time to steep.
If you have any questions, please reach out to our Help Desk, and we'll be happy to assist you.
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