How to Store E-Liquid

Store e-liquid in a cool, dark place with the cap sealed tight. A kitchen cupboard away from the cooker or a bedroom drawer works well. Keep bottles upright and out of direct sunlight. That covers 90% of what you need to know.

The rest of this guide covers why those rules matter, how long vape juice lasts, and how to spot a bottle that's gone off.

Best Storage Conditions for E-Liquid

Heat, light, and air are the three things that break e-liquid down. Each one attacks different parts of the juice.

The best storage temperature for e-liquid sits between 15°C and 25°C. Standard room temperature in most UK homes. Bathrooms are a bad choice because the humidity and temperature swings from showers speed up degradation. Fridges work for long term storage of unopened bottles. Let the juice reach room temperature before you vape it though, or the viscosity will be off.

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How Long Does Vape Juice Last

Shelf life depends on whether the bottle has been opened and how it's stored.

Nic salt e-liquids follow the same shelf life as standard e-liquid. The nicotine salt form doesn't make it last longer or shorter. Store them the same way.

Shortfill e-liquids in larger bottles take longer to use up, so storage matters more. If you've added a nicotine shot, the clock starts from the day you mix it. Shake the bottle well after adding the shot and store it sealed.

Writing the date you opened each bottle on the label with a marker helps you use older juice first. You won't remember once you've got a few bottles on the go.

How to Tell If Vape Juice Has Gone Bad

Your eyes and nose catch most problems before you take a puff.

Colour change. Some darkening over time is normal, especially with nicotine. A slight amber tint in juice that started clear isn't a concern. Dramatic colour shifts are different. If a light coloured juice turns dark brown or black, the nicotine has oxidised heavily and the flavour will taste harsh and peppery.

Smell. Fresh vape juice smells like its flavour. If it smells sour, metallic, or chemical, don't vape it. Nicotine oxidation produces a sharp, peppery smell that's easy to pick up once you know what to look for.

Separation. E-liquid can settle if it's sat still for a while. A quick shake should bring it back together. If the layers won't mix after shaking, or if there are bits floating in the liquid, throw it away.

Texture. VG is naturally thick, but if the juice has become noticeably thicker than when you bought it, or turned watery, something has broken down.

Our guide to what vape juice is made of explains how PG, VG, nicotine, and flavourings interact if you want to understand the chemistry behind why these changes happen.

Vape Juice Turning Brown

Brown vape juice is almost always nicotine oxidation. Oxygen reacts with the nicotine and produces a compound called cotinine, which has a brown colour and a harsh taste. It happens faster in heat and light.

A slight brown tint in an opened bottle that's been around for a few weeks is normal and won't affect the vape much. If the juice has gone very dark and tastes peppery or metallic, the oxidation has gone too far. Sweetener in the juice can also caramelise on coils and turn the liquid in the tank brown. That's a coil issue though, not a storage one.

0mg nicotine juice doesn't brown the same way because there's no nicotine to oxidise. If you're storing juice long term, 0mg bottles hold up the best.