Solvent
Plural: Solvents
Solvent definition
A solvent is a liquid used to dissolve another substance, making it thinner, easier to spread, or easier to clean. In painting, solvents are mainly used to thin oil paint and clean brushes.
- A solvent is a substance, usually a liquid, that dissolves another material (called the solute) to create a solution. The solvent does not necessarily chemically change the material; it separates and disperses its particles within the liquid.
In painting, solvents are commonly used for:
- Thinning oil paint: reducing viscosity to create more fluid brushwork or transparent layers.
- Cleaning brushes and tools: removing oil paint residues after use.
- Preparing surfaces: removing grease, wax, or unwanted residues before painting.
Common artistic solvents include:
- Turpentine: a traditional solvent derived from tree resin, historically used for thinning oil colors and cleaning brushes.
- Mineral spirits (white spirit): a petroleum-based solvent often used as a less aromatic alternative to turpentine.
- Odorless mineral spirits (OMS): a refined version with reduced odor, widely used in studios.
Examples
Context
p>In traditional oil painting, solvents are part of the technical process of controlling paint consistency and layering. However, excessive use of solvent can weaken the paint film by reducing the amount of oil binder, making layers more brittle over time.
Solvents are often discussed together with the principle of fat over lean: early layers may contain more solvent and less oil (lean), while later layers should contain more oil to create flexible, durable paint layers.
Modern artists may choose solvent-free approaches by using water-mixable oils, solvent-free mediums, or cleaning methods based on oils and soaps.
Core Principles
- A solvent dissolves or disperses another substance without necessarily changing its chemical composition.
- In oil painting, solvents control fluidity, transparency, and drying behavior.
- Solvent should be used carefully because too much can weaken the paint film.
- Solvents are different from mediums: solvents mainly dilute and clean, while mediums modify the paint by adding binders, oils, or resins.
Derivation
The word solvent comes from the Latin solvere, meaning “to loosen,” “to release,” or “to dissolve.” It refers to a substance capable of dissolving another material.