A shift in e-liquid hue is a common occurrence and can indicate several factors. Oxidation, primarily caused by exposure to air, often results in a darkening of the liquid, especially in e-liquids containing nicotine. Nicotine reacts with oxygen, turning it a yellowish or brownish color. Steeping, a process of allowing e-liquid to mature, can also darken the color. Heat exposure, whether from storage in warm environments or from the vaping device itself, can further contribute to color change.
Understanding the reasons behind e-liquid color alteration helps users determine whether the product remains safe for use. While slight darkening due to oxidation or steeping is typically harmless, significant or rapid color changes, especially accompanied by a change in odor or taste, can signal degradation and potential health risks. Recognizing these changes empowers vapers to make informed decisions about their e-liquid and prioritize their safety. Early observation of such changes can prevent the use of potentially harmful substances.