Used to dilute oil colour during painting, solvents are also used to clean brushes and palettes after painting. Winsor & Newton solvents are made specifically for artists use and are fully volatile, meaning that they leave no residual matter behind upon evaporation from the paint mixture.
Hardware/DIY grade solvents, though lower in cost, are not refined to the same degree and will often leave a tacky painting surface where used, and a paint film that won't fully dry.
A variety of solvents are available, including a low-odour solvent and solvents specifically for cleaning brushes and pictures.
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