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Why Does my E-liquid Turn Brown

Why Does My Vape Juice Turn Brown? Understanding E-Liquid Discoloration

Most of the time, your e-liquid gets used up quickly. But what happens when you find an old bottle of e-liquid that's been forgotten? Or perhaps you've noticed your vape juice turning brown right there inside the tank of your vape device? Seeing your vape liquid change colour to a shade of brown or even dark brown can be concerning. Let's explore the reasons why e-liquid can turn brown, how to prevent it from doing so, and whether it's safe to use e-liquid that has turned brown.

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How Long Does Vape Juice Normally Last?

Generally, e-liquid has a shelf life of one to two years, depending on the flavour of the vape juice and the base (PG/VG ratio). However, the ingredients can remain stable for much longer if you store your e-liquid correctly. The expiry dates (or produced on dates) on vape products are often there to discourage vaping e-liquid that has overly steeped or developed an unappealing brown colour. While accidentally using expired e-liquid isn't usually dangerous, it might taste off.

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Why Does E-Liquid Turn Brown?

The primary culprits behind your e-liquid turning brown are the oxidation process and photosensitivity (light sensitivity), both often linked to the nicotine content. While a brown hue might seem negative, it's sometimes a side effect of "steeping," a process some vaping enthusiasts use to enhance flavour.

  • Steeping

    Many vapers steep their vape juices to deepen the flavour. This process can involve leaving the juice bottle in a dark place, sometimes with the cap off briefly to introduce air into the liquid, or even gentle shaking. While steeping can improve flavour, it almost always leads to the e-liquid turning a darker yellow or brown due to oxidation of the nicotine.

  • Oxidation

    This is a natural chemical reaction where oxygen molecules bind to the ingredients in e-liquids, most notably the nicotine. Just like a cut apple turns brown, the nicotine in your vape liquid reacts with oxygen, causing the liquid turning brown over time.

  • Photosensitivity

    Just as sunlight fades colours, vape liquid is exposed to UV rays can also cause it to darken. This process works alongside oxidation to change the colour of your juice and potentially reduce its nicotine potency.

Can Your Vape Coils Cause Your Juice to Turn Brown?

Yes, the heat from your vape coils can also contribute to e-cigarette liquid turning brown in the tank. Over time, residue and build up on the coil in your vape tank can heat and caramelize the sweetener in some e-liquids, leading to a brown or black discoloration of the juice sitting in your tank. This is more common with e-liquids containing a lot of sweetener or when you're not cleaning your vape tank and replacing your vape coils regularly.

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Is It Safe to Use E-Liquid That Has Turned Brown?

While there's no strong evidence that vaping older or over-steeped e-liquid is acutely dangerous, it can negatively affect the e-liquid's flavour and nicotine strength, impacting your vaping experience. A juice that has turned significantly dark brown or has an unusual smell or taste should probably be discarded. High-quality vape e-liquids typically range from clear to amber (unless they contain added colours). Anything darker could indicate degradation or improper storage.

How to Prevent Vape Juice from Turning Brown

Here are some tips to prevent your juice from turning brown too quickly and keep it fresh:

  • Store your e-liquid properly

    Keep your e-liquid in a dark place away from direct sunlight and heat. Consider using dark glass bottles that block UV rays. 

  • Keep it away from air

    Ensure your juice bottle and vape tank are sealed properly to minimize juice is exposed to air. 

  • Use e-liquid in a timely manner

    While it has a shelf life, it's best to use e-liquid relatively soon after opening for optimal flavour and nicotine delivery.

  • Clean your vape tank regularly

    This helps prevent build up that can cause your e-liquid to darken and affect the quality of your vape.   

  • Consider high-quality vape e-liquids

    Premium e-liquids may use more stable ingredients and undergo better manufacturing processes.   

Final Thoughts: Understanding E-Liquid Colour

Seeing your vape juice turn brown is a common occurrence. Understanding the factors that contribute to discoloration, such as oxidation, light exposure, and even the heat from your vape coils, can help you take steps to prevent your juice from darkening prematurely. While a slight brown hue might just be steeping, a significant change in colour, especially to deep brown or if accompanied by an off taste or smell, is a good reason to replace your old juice with new juice to ensure your vape remains enjoyable. Always prioritize the quality of your e-liquid and store it in dark and cool conditions to help your juice to last and provide the best vaping experience.

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