E-juice turning brown is a common occurrence primarily due to the following factors:
- Nicotine oxidation
If your vape contains nicotine, nicotine can also cause the e-juice to darken over time. Nicotine is a natural alkaloid that oxidizes and turns brown when exposed to air and light.
- Caramelization of sweeteners and flavorings
Some vapes contain sweeteners and flavourings that can also darken over time. These ingredients undergo caramelization, resulting in a browning effect.
- Expired e-juice
E-juice has a shelf life, and using expired e-juice can lead to colour changes and alterations in flavour.
Please note that e-juice turning colour is generally a common occurrence and not typically a cause for concern.
However, to maintain the quality of your e-juice, store it properly in a cool, dark place and use fresh e-juice from reputable manufacturers.