Beeswax, soy and paraffin: what actually differs

Three waxes cover almost every candle you can buy, and the differences between them are physical rather than moral. Melting point, hardness, how much soot the flame makes, how much scent the wax will carry, and what it costs by weight. Those five things decide whether a wax makes a good taper, a good pillar or a good container candle, and between them they explain most of what a label is trying not to say. Here is what separates beeswax, soy and paraffin, and which to buy for which holder.

Melting point explains most of the rest

Every wax softens over a range rather than at a single temperature. Soy container wax is the softest of the three, melting somewhere around 45 to 55 degrees Celsius. Paraffin comes in grades across a wide band, roughly 46 to 68, because it is refined deliberately to hit a target. Beeswax is the hardest in ordinary use, around 62 to 65.

That one number predicts almost everything else. A wax with a high melting point is hard at room temperature, holds its own shape without a container, and resists slumping in a warm room. A wax with a low melting point has to be poured into glass or tin, because left to stand on its own in a south facing window in July it will lean.

It also drives burn time. A harder wax needs more heat to turn liquid, so the flame consumes it more slowly, and a beeswax candle of a given weight will generally outlast a soy one of the same weight. Not because of anything mysterious, just because it takes more energy to melt.

Paraffin: cheap, versatile, and the soot argument

Paraffin is refined from petroleum. It is the cheapest of the three by a wide margin, it takes dye evenly, it holds and releases fragrance better than any plant wax, and it is made in enough grades to produce a soft container wax, a firm pillar wax and a hard dipping wax for tapers. Most of the candles in most houses are paraffin, including a lot of candles sold as something else.

The soot argument is worth stating plainly, because it is usually overstated in both directions. All candles soot. Soot is unburnt carbon, and it comes from a flame that is getting more fuel than it can completely burn. The main causes are a wick that is too long, a wick that is too thick for the wax, and moving air. Wax type matters far less than any of those. A well trimmed paraffin candle in still air produces less soot than a badly trimmed beeswax one in a draught.

What is true of all three is that burning anything in a closed room adds fine particulates to the air in it. That is combustion, not a flaw in a particular wax. Crack a window, do not burn several candles in a small sealed room for hours, and never leave a lit candle in a room you are not in.

Soy: container wax, and the lumpy top

Soy wax is hydrogenated soybean oil. It is soft, it melts low, and it sticks well to glass, which is why almost all soy candles come in a jar or a tin. A freestanding soy pillar exists but needs stiffening additives, and an unmodified one will deform on a warm shelf.

Two cosmetic things worry people and neither is a defect. Frosting is the pale crystalline bloom that appears on the surface after a week or two, and it is the wax trying to return to its natural crystal structure. Wet spots are the patches where the wax has pulled away from the inside of the glass as it cooled and contracted. Both are normal in vegetable waxes and neither changes how the candle burns.

Soy burns a little cooler and a little slower than a soft paraffin, which is where the longer burn claims come from, and it carries less fragrance at the same loading, which is the part the claims leave out. If scent throw across a room is what you are buying, soy is the harder wax to get it from.

Beeswax: the hardest, the dearest, the best taper

Beeswax is a byproduct of honey production, it is naturally a yellow that varies by season and forage, and it smells faintly of honey on its own. That smell is also why it is rarely scented: the wax has an opinion already and fragrance fights it. It costs several times what paraffin costs by weight, and the price moves with the honey harvest.

Its hardness is the practical reason to buy it. A taper burns by holding a shallow pool of molten wax inside a rim of solid wax at the tip, and a hard wax makes a stronger rim that is slower to break down on one side. That is why beeswax tapers are the least likely to drip, though no candle is drip proof in moving air. If dripping is your actual problem, the draught is nearly always the cause rather than the candle.

One claim is worth addressing because it is everywhere. There is no reliable evidence that beeswax candles improve indoor air, neutralise pollutants or release useful negative ions. Burning beeswax is still burning something. Buy it because it is hard, long lasting and smells good, which are real reasons.

Blends, and what natural means on a label

There is no general legal minimum for the wax named on the front of a candle in most markets. A candle sold as a soy blend can be mostly paraffin with enough soy in it to justify the word. A beeswax blend can be a few per cent beeswax. If the percentage is not stated, assume it is low, because a maker who has paid for a high percentage usually says the number.

Coconut and rapeseed waxes are now common in container candles and both behave broadly like soy: soft, low melting, good adhesion, modest scent throw. Palm wax makes a hard, crystalline pillar, and is the one with a supply chain worth asking about, because palm oil cultivation is tied to deforestation. Certification schemes exist and a maker using certified stock will generally say so.

Natural, clean burning and non toxic are unregulated words on a candle and tell you nothing. The things that do tell you something are the named wax and its percentage, the fragrance load, and the wick. Cotton and paper cored wicks are the common ones. Lead cored wicks were banned in the United States in 2003, so a current candle should not have one, but a very old candle in a drawer might.

Which wax for which holder

For a socket, meaning a narrow hole that grips the base of a candle, you want a taper in beeswax or a hard dipped paraffin. Soft wax in a socket bends, and a wide shallow socket is not a taper socket at all. The owl candle holder has its socket in the crown of its head and is made for a standard pillar rather than a taper, which is worth checking on any holder before you buy candles for it.

For a dish, meaning a flat plate with a lip, you want a pillar in a hard paraffin or a stearic blended wax that will stand up on its own and keep its edge as it burns down. The iron scroll sconce and the black cat candlesticks both hold a shallow dish for a pillar, despite what the second name suggests. A pillar wedged into a narrow taper socket is unstable and a taper leaning in a pillar dish will drip, so the two are not interchangeable.

For a jar or tin, soy and the soft paraffins are what the format exists for. Stop burning a container candle while there is roughly ten millimetres of wax left, because past that the flame is heating glass or metal directly. The rest of the rules are the same whatever the wax: a stable non combustible surface, nothing combustible within about 100mm, nothing hanging above the flame, and out before you leave the room.

Questions people actually ask

Which candle wax burns the longest?

Beeswax, for a given weight, because it has the highest melting point of the three and so takes more heat to consume. Soy is next and soft paraffin is the quickest. Wick size and draughts change this more than people expect, so a well made paraffin candle can outlast a badly wicked beeswax one.

Is soy wax better than paraffin?

Not inherently, and not in terms of soot. Soy is softer, melts lower, suits containers and carries less fragrance. Paraffin is cheaper, comes in harder grades for pillars and tapers, and throws scent further. Soot comes mainly from wick length and moving air rather than from the wax.

Do beeswax candles purify the air?

No. There is no reliable evidence that beeswax candles clean indoor air or release useful negative ions. Any candle burning in a closed room adds fine particles to it, so ventilate the room rather than relying on the wax.

Why does the top of my soy candle look frosty?

Frosting is the wax crystallising back towards its natural structure, and it is cosmetic. The same goes for wet spots, where the wax has shrunk away from the glass as it cooled. Neither affects the burn.