Natural Wax vs Synthetic Candles — What's Actually in Your Candle?

If you've ever wondered why some candles fill a room with warm, layered fragrance — and others give you a headache after fifteen minutes — the answer is almost always in the wax and the fragrance oil. Most candles sold in the UK are made from paraffin scented with synthetic Parfum. Some are made from natural wax scented with organic essential oils. They look identical on a shelf. They are very different objects.

Here's what's actually inside each, and why it matters for what you breathe in.

What synthetic candles are usually made of

Three components: a wax, a wick, and a fragrance oil.

The wax in mass-produced candles is almost always paraffin, a by-product of petroleum refining. It's cheap, holds fragrance well, and burns predictably — which is why supermarket candles use it. The downside is that paraffin combustion releases benzene, toluene, and fine particulate matter into the air you're breathing. Research from South Carolina State University in 2009 was one of the earlier studies to flag this; more recent EU research has reinforced the picture.

The wick is sometimes a metal-cored wick. UK candles haven't legally used lead wicks since the early 2000s, but cheaper imports occasionally slip through. A metal core helps the wick stand up in liquid wax — but the metal also ends up in the air.

The fragrance is the part most people don't realise. "Parfum" on the label is a single legal word that can stand in for dozens of synthetic compounds the manufacturer doesn't have to disclose. Phthalates — used to make synthetic fragrance last longer — are one of the most common, and a growing body of research links them to endocrine-disrupting effects.

What natural wax candles are made of

The natural-wax category covers four main waxes: soy, rapeseed, coconut, and beeswax. Each has different properties.

• Soy wax is the most common in eco candle lines. Burns cleanly but releases scent slowly and can frost.
• Rapeseed wax (oilseed rape) is UK-grown, vegan, and produces a particularly clean burn with strong scent throw. We use it in our standard candle line.
• Coconut wax burns longest and carries fragrance brilliantly. We use organic coconut wax in our Collection Apothicaire candles.
• Beeswax burns the cleanest of all natural waxes, but doesn't hold added fragrance well — it has its own honey-warm scent.

For wicks, natural-wax candles typically use untreated cotton or wood. Cotton burns cleanly and is what we use across our range.

For fragrance, the gold standard is certified organic essential oils. They're more expensive than synthetic Parfum, they don't last as long in the bottle, and they don't carry as far in cheap waxes — but burned in a properly formulated natural wax, the scent is more complex, more rounded, and won't leave that flat synthetic edge that sits at the back of your throat.

How to tell the difference at the shelf

Three quick checks before you buy:

1. Read the label. If the ingredients list shows "Parfum", "Fragrance", or no ingredients list at all, it's almost certainly synthetic. If it lists essential oils by their Latin names, it's natural.
2. Check the wax type. Brands using natural wax will say so prominently — "100% soy", "rapeseed wax", "coconut blend". Brands using paraffin rarely volunteer it.
3. Look for the burn-time claim. A 200g paraffin candle will claim 40–50 hours. A 200g coconut-wax candle will deliver 45–55 hours — and burn far more cleanly along the way. If a candle claims an unusually long burn time for its size, it's a fragrance-load and wax-quality red flag.

Why we hand-pour ours in the UK

Every Vanilla Blanc candle is hand-poured by master artisans with over 25 years' experience. Rapeseed wax (or organic coconut for our Collection Apothicaire), untreated cotton wick, certified organic essential oils, hand-poured into our Signature® wooden gift box. Forty-five hours of clean burn. No paraffin, no synthetic Parfum, no phthalates.

It costs more to make a candle this way. Customers who've spent a year on supermarket candles tell us they don't go back — not because of brand loyalty, but because the air in the room is different.

FAQ

Is soy wax always better than paraffin?

For health, yes — soy burns far cleaner. For scent throw, it depends on the formulation; some cheap soy candles have weak scent because the wax/oil ratio is wrong. Look for soy candles with a clear essential oil ingredient list, not just "soy wax + Parfum".

Why is my candle tunnelling (burning down the middle)?

You're not burning it long enough on each session. A candle needs to liquefy the entire top layer of wax to remember its full diameter — typically two to three hours on first burn. Short burns create a memory ring that gets smaller each time.

Are essential-oil candles safe to burn around babies and pets?

Generally yes, but with care. Avoid heavy essential-oil concentrations in nurseries; ventilate rooms occasionally. Cats are sensitive to certain oils (tea tree, peppermint, undiluted citrus) — keep candles in rooms they don't frequent.

How do I store unburned candles?

Out of direct sunlight, in their wooden box if applicable. Heat and UV degrade the essential oils. A candle stored in a hot conservatory for six months will smell weaker than one stored in a cool drawer.

Browse our hand-poured natural-wax candles — made in the UK, free from synthetic Parfum, in our Signature® wooden gift box.