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Turpentine
C10H16
Turpentine (also called spirit of turpentine) is a fluid obtained by the distillation of resin harvested from pine trees. It is a vital organic solvent used extensively in paint formulation, varnish production, and chemical synthesis for industrial and medicinal applications.
Description of what it is like
A clear, colorless liquid with a strong, characteristic pine odor. It is immiscible with water, highly volatile, and flammable. When exposed to air and light, it gradually oxidizes, thickens, and turns yellow or amber.
Origin and where to find it
- Environments: Coniferous forests rich in pine trees (Pinus species such as maritime pine, slash pine, or longleaf pine).
- Signs: Resin or pitch bleeding from wounds on pine tree bark; aromatic pine smell near tapped trunks.
- Natural vs Synthetic: Natural plant resin distillate; can also be recovered as a byproduct during sulfate kraft pulping (sulfate turpentine).
Minimum processing required
- Resin Tapping: Tapping live pine trees by V-shaped bark incisions to collect oleoresin in cups.
- Steam Distillation: Heating the crude resin with steam in an Alembic or Distillation apparatus.
- Separation: Condensing the vapor into two layers: volatile liquid turpentine spirits floating on water, leaving solid rosin (colophony) in the boiling kettle.
- Dehydration: Separating the top organic layer and drying over anhydrous salt or filtering.
Tools needed to work on it
- Tapping Tools: Hack/chisel and collection pots.
- Distillation Vessel: Copper or glass Alembic equipped with a condenser.
- Heat Source: Controlled furnace or steam boiler.
Common forms of use
- Liquid Solvent: Thinning oil-based Paint, lacquers, and varnishes.
- Chemical Precursor: Synthetic pinene feedstock for camphor, terpineol, and fragrance compounds.
- Topical Medicine: Component of traditional counter-irritant liniments for chest rubs and muscle relief.
Possible substitutes
- Mineral Spirits (White Spirit): Petroleum-derived solvent substitute for paint thinning.
- Ether: Volatile solvent for non-polar extraction, though much more flammable.
- ** Citrus Terpenes (d-Limonene):** Solvent extracted from citrus peels; effective for cleaning and thinning.
Limitations and common failures
- Resin Polymerization: Storing in open or partially filled clear bottles causes oxidation into gummy, sticky residues.
- Corrosion of Rubber: Rapidly degrades natural rubber seals, tubing, and containers.
Risks and safety
- Flammability: Highly flammable liquid; vapors can form explosive mixtures with air.
- Toxicity and Inhalation: Vapors cause eye irritation, headaches, and dizziness; harmful if swallowed or absorbed through skin.
- Spontaneous Combustion: Rags soaked in turpentine and oil paint can self-heat and catch fire if piled up without ventilation.