Pine resin salve: working with rosin without ruining every pan you own

A pine resin salve at 15 percent resin and 10 percent beeswax, with a 95 C melt stage, a filtering method, a 30 ml tin and the colophony allergy stated.

Pine resin is the only common salve ingredient that refuses to behave like either a wax or an oil. It is a brittle glass at room temperature, it carries bark and grit that will never dissolve, it needs a melt stage far hotter than anything else on this site, and it is one of the most frequently positive allergens in routine patch testing. This page gives the formula, the hot stage, the filtering and cleaning methods, and what you may not say about the result.

• INCI: Colophonium
• Resin 15% by weight
• Melt 90 to 100 C
• Pour 78 to 86 C
• Standard patch test allergen

What pine resin is, and which part of it you are using

The sticky material on a wounded pine is oleoresin: roughly 20 to 25 percent volatile terpenes, mostly alpha and beta pinene, and the rest a mixture of resin acids. Leave it on the trunk and the terpenes evaporate, which is why old resin is a hard amber lump and fresh resin is a tacky, aromatic mess. What remains once the volatiles have gone is rosin, the same material sold industrially as colophony, INCI name Colophonium.

Rosin is about 90 percent resin acids, dominated by abietic, dehydroabietic, neoabietic, palustric and pimaric acids, with roughly 10 percent neutral unsaponifiable matter. Its acid value is in the region of 155 to 175 mg KOH per gram, high enough that hot alkali turns it into soap, which you will use when you clean the pan. It is amorphous rather than crystalline, so it has no melting point in the sense a wax has one. Softening measured by the ring and ball method (ASTM E28) lands around 70 to 85 C for typical gum rosin grades, but the material creeps and sticks at well under 40 C.

That amorphous character matters for the finished salve. Beeswax stiffens a salve by building a crystal network that traps liquid oil, the mechanism set out at oleogels and wax networks. Rosin does not crystallise. It thickens the oil phase itself and raises its adhesion, so the salve gets firmer and much stickier at the same time. A tin made to this formula reads roughly as firm as a 13 to 15 percent beeswax balm, and behaves nothing like one on the skin.

Collecting and cleaning the resin

Take resin that has already exuded and hardened, from fallen limbs, felled timber or old wounds, and do not cut a living tree to make it bleed. Fresh oleoresin is also the worse raw material here: it carries water, it carries a large volatile fraction that boils off in your kitchen at the melt temperature, and pinene and its oxidation products are sensitisers in their own right.

What you collect is not resin, it is resin plus everything that stuck to it. Bark, needles, sand, insects and lichen are commonly 10 to 30 percent of the collected weight and occasionally more than half. None of it dissolves, nor does the cell debris in fresh gum. Water does not dissolve either, and at 95 C it does something worse than nothing.

Break the lumps cold. Resin is brittle at freezer temperature and gummy at room temperature, so an hour in the freezer and a few taps with a hammer inside a folded cloth gives fragments you can pick over. Discard anything more bark than resin, and do not wash it: that adds water to a material about to be heated past the boiling point of water.

Using that concentrate below: a 250 g batch at 15 percent resin needs 250 times 0.15 divided by 0.43, or 87 g of concentrate, which carries 50 g of oil with it, so the oil line drops from 187.25 g to about 137 g. The batch calculator will scale it for you.

The formula

Weight percent of the total batch, totalling exactly 100. The gram column is a 250 g batch, which fills eight 30 ml tins at 27 g with about 15 percent left behind on the sieve, the jug and the spatula. Losses on this formula are higher than on an ordinary balm because a fraction of every batch stays on the filter.

The oil is a deliberate choice rather than a default. It has to sit at 95 C for half an hour, so anything with a meaningful polyunsaturated fraction is being cooked. High oleic sunflower, olive or a high oleic safflower all survive that; hemp, rosehip, grapeseed and walnut do not, for the reasons at rancidity and oxidation. The stability advantage of the high oleic grades is set out at high oleic oils.

Ten percent beeswax is lower than it looks, because the resin is already stiffening the oil. Fifteen percent wax on top of 15 percent resin gives something closer to a shoe polish than a salve. Tocopherol goes in at 0.1 percent after the batch has cooled below 60 C, since adding it to a 95 C melt largely wastes it; the working range and the reason more is not better are at vitamin E and antioxidants. There is no fragrance in this formula. The resin smells of resin, and adding sensitisers to a product built around a known sensitiser is a poor trade.

What the resin percentage actually does

Tack is the property people either want from this salve or hate about it. It is why a resin salve stays on a knuckle through an afternoon of work when a plain oil and wax salve is gone in twenty minutes, and why the same salve picks up sawdust, glove lining and pocket lint. The vocabulary for the properties being traded is at balm texture science.

If you want cling without stickiness, resin is the wrong lever and castor oil or lanolin is the right one. A resin salve is for the person who wants the film to be obvious. For a softer traditional version, use the herbal salve method, and for a hand product built on cling rather than tack see the gardener's hand salve.

The hot stage: 90 to 100 C on a bench that otherwise stops at 80

Every other formula here melts at 70 to 80 C, which is enough for any wax or butter in the cupboard and gentle enough to be safe. Rosin is different. Softening it is not the same as dissolving it, and hardened fragments need both temperature and contact time before the last pieces go into solution. A hold of 20 to 40 minutes at 90 to 100 C clears a batch of this size. Below about 85 C you are still finding gritty specks an hour later, and those specks are undissolved resin rather than debris. Why solvent power and temperature interact this way is covered at solubility in anhydrous formulas.

A simmering water bath cannot deliver this: heat transfer stalls long before the contents get near 95 C, so you sit at 85 C forever. Use gentle direct heat in a heavy based pan, or a sand or oil bath, with a probe thermometer in the liquid rather than a hob dial. The pan, thermometer and sieves worth owning are at equipment.

Filtering hot, through metal and not cloth

Filter as soon as the resin has dissolved, while the blend is above 85 C. Below about 70 C this mixture thickens sharply and will simply sit on the mesh.

1. Preheat the sieves. Both of them, in a 100 C oven for ten minutes. A cold sieve gels the blend on contact and you lose the batch to the mesh.
2. Coarse pass first. A standard kitchen sieve of roughly 1 to 2 mm takes out bark, needles and the large debris in one go.
3. Fine pass second. A 0.2 to 0.3 mm stainless mesh, which is a fine conical strainer or a good tea strainer, takes out the grit you would otherwise feel on the skin.
4. Do not press. Let it drain. Pressing pushes fine debris straight through the mesh, which is the usual cause of a gritty tin.
5. Reheat if it stalls. If the flow stops, put the jug back on the heat for a minute rather than forcing it.

Cloth is the obvious choice and the wrong one. Muslin absorbs and holds several grams of a batch this size, blinds almost immediately against warm rosin, sheds fibres into the product you are trying to clarify, and is refuse once used. Metal mesh drains faster, holds far less, and can be cleaned and reused. Coffee filters and paper towel are worse than cloth on every count.

Pouring, tins and cure

Pour 30 ml tins at 78 to 86 C, far hotter than the 60 to 68 C window a normal salve uses. The reason is viscosity rather than crystallisation: this blend goes thick and stringy on the way down, and a pour that starts at 70 C ends in ridged, half-set tins. Matching a pour window to a formula is covered at pour temperatures.

Work in one continuous movement per tin, fill to about 2 mm below the rim, and wipe the rim of each tin with kitchen paper before it sets. Resin on the rim glues the lid on, and a customer who has to lever the tin open with a knife will not buy a second one. Expect a shallow centre dip; a single warm top-up pour fixes it. Cure 48 hours before judging the texture or capping for storage, because tack keeps developing after the salve is visibly solid, and a tin judged at twenty minutes reads much softer than the same tin two days later.

Cleaning up

Do this while everything is still hot. Wipe the pan, sieve, spatula and thermometer out with kitchen paper and a splash of fresh oil, which lifts most of the residue in one pass, then wash in very hot water with a strong detergent. For the film that remains, two things work: isopropanol or denatured alcohol on a cloth, which dissolves rosin readily, or simmering a strong washing soda solution in the pan for ten minutes, which saponifies the resin acids into a soluble soap. Wear gloves for that, and keep hot soda solution away from aluminium. Cold water, a dishwasher and leaving it until tomorrow all fail. The practical answer is one dedicated pan and one dedicated sieve.

Colophony is a standard patch test allergen

This is the part of the page that matters most. Colophony sits in the European baseline series, tested at 20 percent in petrolatum, precisely because it is one of the allergens that turns up often enough to be worth screening everyone for. Across European and North American surveillance networks, roughly 1.5 to 4 percent of patients patch tested for suspected contact dermatitis react to it, depending on the network and the year. That figure describes a tested population with skin problems, not the general public, so it is an upper bound on what you should expect in ordinary use. It is still high for a material you are about to put in a tin at 15 percent.

The sensitisers are mostly oxidation products of abietic acid rather than the fresh resin acids, which has two consequences. Weathered, badly stored resin is worse than fresh, so collect well and keep the tins cool and closed. And an allergy acquired anywhere carries over: sticking plasters, adhesive tapes, violin and gymnastic rosin, depilatory wax and some mascaras all use colophony or its derivatives, so a customer can be sensitised long before meeting your salve.

What you can honestly say about it

Pine resin salve arrives loaded with folklore. It is the classic drawing salve, said to pull out splinters, thorns and infection. Every one of those claims is outside cosmetic wording, and most are outside what the evidence supports at all. Drawing out a foreign body or an infection is a therapeutic claim in the UK, the EU and the US alike, and a product applied to broken skin is not being used as a cosmetic at all, so the framework you were relying on stops applying. The wider folklore, including the dangerous escharotic products sold under the same word, is at drawing salves and black salve.

The full reasoning for each jurisdiction, and the list of words that quietly convert a cosmetic into a medicine, is at cosmetic or drug claims.

What goes wrong

When not to make this at all

Three situations make the answer no. If anyone in the household or the customer base has a colophony or sticking plaster allergy, the risk is concrete rather than theoretical and there is no formulation trick that removes it. If you cannot run a 95 C stage safely, with a probe thermometer, a heavy pan, ventilation and nobody else in the kitchen, make a different salve; this is the only formula on the site that asks for that temperature and it is not worth an accident. And if what you actually want is the folklore, the splinter drawing and the wound salve, then a cosmetic is the wrong product and no amount of careful wording will make it the right one.

What is left is genuinely useful and hard to buy: a salve whose film stays put through work and washing, from four ingredients, one of which you pick up off the ground. Make the 250 g batch at 15 percent and live with it for a fortnight before adjusting, because tack is the property people change their minds about. If it is too much, 10 percent is the next stop down; if the tack is the point, a climber's hand salve is the adjacent formula.

Reviewed and updated 6 September 2026. Spotted an error? Tell us and we will fix and log it.