Darkening of eliquid is normal over time.
This can happen because of:
- Oxidation is when nicotine interacts with and is exposed to oxygen. This "Chemical Reaction" can cause eliquid to darken.
- Exposure to light and heat
- Gradually causing the nicotine in e-liquid to change color.
- eLiquids use a range of flavours and sweetners so colour shades will naturally vary across brands and variants.