Lamp Oil, Liquid Paraffin and the Fuels That Must Never Go Near an Indoor Lamp
The bottle you fill the lamp with decides whether the evening smells of nothing at all or of a chip shop, and in the worst cases it decides whether the lamp is safe. Fuel is where most oil lamp trouble starts, and it is also the easiest thing to get right.
Contents
What ultra-pure lamp oil actually is
Indoor lamp oil is a highly refined liquid paraffin: a clear, almost odourless mineral oil with the aromatic compounds stripped out. That refining is precisely what you are paying for. The cheaper and dirtier the oil, the more it smells while burning and the faster it darkens the chimney.
Reading the label instead of the price
Look for wording that names the product as lamp oil or liquid paraffin intended for indoor lamps, and check that the cap is child-resistant. Anything described as torch fuel, patio fuel or citronella is an outdoor product regardless of how similar the bottle looks. Suppliers who sell fuel alongside wicks and chimneys tend to label the distinction clearly, and a specialist listing such as https://lamplight.us.org/ makes the categories easier to tell apart than a garden centre shelf does.
The fuels that are simply not options
Petrol and other volatile spirits vaporise far below the temperature a lamp is designed for and can flash over. Methylated spirit burns with an almost invisible flame in a device that assumes a visible one. Outdoor torch fuel and citronella are formulated to be burnt in the open air and produce soot and fumes indoors that no amount of ventilation makes pleasant.
Citronella, corrected
The persistent claim that citronella oil is fine in an ordinary indoor lamp is wrong. It belongs in garden torches, outside, where its heavier combustion products disperse. Putting it in a table lamp gives you a smoking wick, a blackened chimney and a room full of fumes, and it does nothing useful about insects indoors.
Scented indoor oils
Scented lamp oils exist and some are pleasant, but the fragrance is added to a refined base and always burns slightly dirtier than the plain version. If you use them, keep the flame low, ventilate properly and do not use them in a small bedroom.
Buying quantities sensibly
- A litre lasts a long time at ordinary evening use, so start small.
- Keep fuel in its original bottle with the safety cap fitted.
- Never decant into a drinks bottle, jar or unlabelled container.
- Store upright, cool, out of sunlight and locked away from children and pets.
- Buy plain refined oil first and try scent later, not the other way round.
The poisoning risk deserves plain language
Swallowed lamp oil is a serious matter for a small child, chiefly because it can pass into the lungs and cause severe damage. If it happens, ring a poison centre or emergency services immediately and do not try to make the child sick. The same applies to any oily fuel found in a cupboard.
Filling without mess
Fill only a cold, extinguished lamp, use a funnel, and stop at the marked level so the fuel has room to expand and the wick tube stays clear. Wipe the outside of the fount and the table before lighting, because a film of oil on the glass will burn where you never intended a flame to be.