White spirit is a petroleum-based solvent made from a mixture of hydrocarbons, widely used for thinning oil-based paints, cleaning brushes, and degreasing metal surfaces. It sits in the middle ground between lighter solvents like acetone and heavier ones like kerosene, evaporating slowly enough to be practical but fast enough to leave surfaces clean. You’ll find it in virtually every hardware store, and it goes by different names depending on where you live.
What White Spirit Is Made Of
White spirit is a blend of carbon-based molecules containing 7 to 12 carbon atoms each. About 80 to 85% of the mixture consists of straight-chain and ring-shaped saturated hydrocarbons (the same general family of molecules found in gasoline and kerosene, just in a different size range). The remaining 15 to 20% is aromatic hydrocarbons, which are ring-shaped molecules that give the solvent some of its dissolving power but also contribute to its smell and health risks.
The solvent boils between roughly 130°C and 230°C (266–446°F), which is why it evaporates more slowly than lighter solvents. Its density is about 0.78 relative to water, so it floats on water and won’t mix with it. The flash point for the regular grade falls between 31°C and 54°C (88–129°F), making it flammable but less so than many other solvents.
Different Names for the Same Thing
White spirit is the standard term in the UK and much of Europe. In the United States and Canada, the same product is typically sold as “mineral spirits.” The CDC and NIOSH also list it under the name “Stoddard solvent,” a term that originated from a specific formulation developed for the dry cleaning industry. You may also see it labeled as petroleum solvent or spotting naphtha. These are all essentially the same product: a refined petroleum distillate with a boiling range in the 150–200°C neighborhood.
Grades and Varieties
White spirit comes in several grades based on how much processing it has undergone. Type 0 is the least refined, a straight distillation fraction with no further treatment, consisting mostly of C9 to C12 hydrocarbons with a boiling range of 140–200°C. Type 1 (the most common, and the basis for Stoddard solvent) has been hydrodesulfurized to remove sulfur compounds. Types 2 and 3 undergo additional processing to reduce aromatic content even further.
The practical difference you’ll notice is smell. Low-odor or odorless mineral spirits have had most of their aromatic hydrocarbons stripped out through extra refining. They cost more but produce far less of the characteristic petroleum smell that regular white spirit carries. For indoor painting or art use, the low-odor versions are significantly more pleasant to work with.
There are also three flash-point categories. Low-flash white spirit ignites at 21–30°C, regular at 31–54°C, and high-flash above 55°C. High-flash grades are safer for enclosed workspaces but evaporate more slowly.
Common Uses
The most familiar use is thinning oil-based paints and cleaning brushes after painting. White spirit dissolves the binders in alkyd and oil paints, making them flow more easily and allowing you to clean tools before the paint hardens. It’s also the standard solvent for wiping down surfaces before applying varnish or stain, since it evaporates without leaving a residue (as long as you’re using a decent quality product; cheap grades can leave behind traces that interfere with paint adhesion).
Beyond painting, white spirit is widely used as an industrial degreaser. It cuts through oils, greases, and waxes on metal parts, making it a staple in workshops and manufacturing. It also works for removing adhesive residue, cleaning mechanical parts, and spot-cleaning fabrics, though dry cleaners have largely moved to other solvents.
White Spirit vs. Turpentine
Turpentine is distilled from pine tree resin, while white spirit comes from petroleum. This difference in origin gives them different strengths. Turpentine dissolves natural resins like dammar, copal, and mastic, making it essential for mixing certain varnishes and glaze mediums used in fine art. White spirit cannot dissolve these natural resins, but it does dissolve alkyd resins, so it’s the right choice for thinning alkyd paints and mediums.
White spirit is generally less flammable and less toxic than turpentine. It also costs considerably less. Turpentine evaporates faster, dries more evenly, and historically has been the preferred solvent for oil painters. White spirit takes roughly 6 to 8 hours to fully evaporate. For most household painting and cleaning tasks, white spirit is the more practical and economical choice. For artists working with natural resin varnishes, turpentine remains necessary.
Health Effects of Exposure
White spirit affects the body primarily through inhalation and skin contact. Breathing in the vapors in a poorly ventilated space can cause dizziness, headache, and a feeling of drowsiness. These are signs that the solvent is affecting your central nervous system, and they typically resolve once you move to fresh air. At higher concentrations or with prolonged exposure, effects can escalate to confusion, memory problems, numbness in the arms and legs, and in severe cases, convulsions.
On the skin, white spirit strips away natural oils and can cause irritation, dryness, and cracking. Prolonged or repeated contact may lead to a condition similar to chemical burns, and in extreme cases, tissue damage beneath the skin surface. Swallowing white spirit is a medical emergency that can damage the throat and stomach lining, and the greatest danger is aspiration into the lungs, which can cause severe chemical pneumonia.
Long-term occupational exposure at elevated levels has been linked to chronic neurological effects, including persistent problems with concentration and memory. OSHA sets the permissible workplace exposure limit for Stoddard solvent at 100 ppm over an 8-hour workday in general industry, with construction and maritime limits set at 200 ppm.
Safe Handling Practices
Ventilation is the single most important precaution. Open windows, use fans, or work outdoors whenever possible. If you’re using white spirit in an enclosed space for more than a few minutes, a respirator with an organic vapor cartridge provides real protection, while a simple dust mask does nothing against solvent vapors.
Wear chemical-resistant gloves (nitrile works well) to prevent skin contact. If white spirit gets on your skin, wash the area with soap and water promptly. Keep it away from open flames, sparks, and hot surfaces, since the vapors are heavier than air and can travel along floors to ignition sources some distance away. Store containers tightly sealed in a cool, well-ventilated area away from heat.
Used white spirit should never be poured down drains or into the ground. It is toxic to aquatic life and classified as hazardous waste. Most municipalities accept it at household hazardous waste collection points. If you use white spirit for brush cleaning, you can let the used solvent sit in a sealed jar until the paint particles settle to the bottom, then carefully pour off the clear solvent on top and reuse it.