Gum spirits of turpentine is a natural solvent distilled from the sticky resin of pine trees, and its uses span oil painting, industrial chemical production, and a long (now mostly abandoned) history as a folk medicine. It remains one of the most important natural solvents in fine art and serves as a raw material for synthesizing camphor, menthol, and fragrances. Its role in medicine, however, has largely ended due to serious toxicity concerns.
What Gum Spirits of Turpentine Actually Is
Gum spirits comes from tapping living pine trees, collecting the raw resin, and steam-distilling it into a clear, strong-smelling liquid. The most common source in the United States is the slash pine, native to the southeastern states, particularly southern Georgia. This process yields a product that is chemically distinct from “wood turpentine,” which is a byproduct of paper mill operations and contains sulfate residues and other impurities.
The main active compounds are alpha-pinene (58 to 65 percent) and beta-pinene (around 30 percent). These terpenes give gum spirits its characteristic pine smell and its powerful solvent properties. They’re also what make it both useful and potentially dangerous.
Oil Painting and Fine Art
This is the use most people encounter today. Gum spirits of turpentine has been the traditional solvent of choice for oil painters for centuries, and many artists still prefer it over petroleum-based mineral spirits. It thins oil paint effectively, dissolves natural resins like damar and mastic for making varnishes, and cleans brushes.
Artists favor gum spirits for several practical reasons. It evaporates slightly faster than mineral spirits, which means thinner paint layers dry more quickly. More importantly, the terpene compounds in gum turpentine may actually help oil paint cure by incorporating oxygen into the paint film, essentially oxidizing the layer from the inside out. Mineral spirits can’t do this. The result, according to many painters, is a more uniform texture and a tougher finished surface. Natural resin varnishes also dissolve more readily in gum spirits than in mineral alternatives, which matters when building up traditional glazing techniques.
Because gum spirits reacts with air over time, forming peroxide compounds, artists typically store it in amber glass containers, sometimes with pebbles or glass marbles to minimize the air space above the liquid.
Industrial and Chemical Manufacturing
Beyond the artist’s studio, gum spirits and its chemical cousins are feedstocks for several large-scale industries. Alpha-pinene, the dominant compound, is the starting material for most of the world’s synthetic camphor. Beta-pinene gets cracked into myrcene, which companies like Takasago use as the basis for synthetic menthol production.
Turpentine-derived terpenes also show up in household products you wouldn’t expect. They’re used to create fragrance compounds for cleaning products, air fresheners, and personal care items. Pine-scented cleaners, for instance, often contain terpene derivatives originally sourced from turpentine production. The same chemistry makes gum spirits useful as a solvent in varnishes, sealants, and wood finishes outside of fine art.
Historical Medicinal Uses
For several hundred years, turpentine oil was a staple of European medicine. Its uses were remarkably broad. Sixteenth-century medical texts describe it as a treatment for “all windy illnesses,” a term that covered both respiratory conditions and intestinal complaints. For coughs, patients inhaled turpentine fumes rising from hot coals through a funnel. For bowel troubles, including painful straining, similar fumigation methods were used from below.
Topically, turpentine oil was applied to wounds, swollen joints, nerve pain, gout, and paralysis. One period source describes it as “very good and excellent for palsy, gouts and swelling, or shrinking and ache of the sinews, if it be caused of cold, if the place be anointed therewith.” It was considered a warming remedy, best suited for ailments believed to stem from cold or dampness. Turpentine even found a role in embalming. When the English crown procured supplies for Edward I in 1306, distilled oil of turpentine appeared on the list, possibly intended for preserving the king’s body after death.
By the 19th century, turpentine was widely used as a treatment for intestinal parasites, a practice that persisted in folk medicine well into the 20th century. Some people still advocate for this use today, but modern evidence on safety makes it a genuinely risky practice.
Why Internal Use Is Dangerous
Turpentine is toxic when swallowed. Ingesting more than about 2 milliliters per kilogram of body weight is considered potentially lethal, and as little as 15 milliliters (roughly one tablespoon) has killed a two-year-old child. Even smaller amounts can cause serious harm.
Swallowing turpentine can damage the kidneys, potentially causing blood in the urine or complete kidney failure. Its effects on the nervous system include dizziness, drowsiness, tremors, seizures, and loss of consciousness. At lower doses, some people experience a feeling of euphoria, which historically may have been mistaken for a therapeutic effect. The vapors alone can irritate the lungs and airways, and prolonged skin contact causes chemical burns.
Current Regulatory Status
The U.S. Food and Drug Administration does not recognize turpentine oil as safe or effective for any over-the-counter medicinal use. It was once an ingredient in products marketed as nasal decongestants, expectorants, external pain relievers, insect bite treatments, and even hemorrhoid creams. The FDA reviewed all of these uses and found inadequate evidence to support any of them. Any product sold today containing turpentine oil as an active drug ingredient, without an approved new drug application, is considered misbranded under federal law.
This is worth understanding clearly: turpentine was not banned because of some regulatory technicality. It was evaluated and found to lack sufficient evidence of both safety and effectiveness for every medicinal claim that had been made for it.
Safe Handling as a Solvent
If you’re using gum spirits for painting or finishing wood, proper handling matters. It’s classified as a volatile organic compound, meaning it releases fumes that contribute to air pollution and pose health risks in enclosed spaces. Always work with adequate ventilation, ideally with an open window and a fan moving air away from your face. Avoid skin contact where possible, and never use it near open flames, as it’s highly flammable.
Disposal requires care. Used turpentine should never go down the drain or into household trash. Most municipalities classify it as hazardous waste. Many areas offer periodic household hazardous waste collection events, or you can check with your local waste management authority for drop-off locations. For artists who use large quantities, letting the used turpentine sit in a sealed jar allows paint particles to settle to the bottom, and the clear liquid on top can be carefully poured off and reused.