Hobbies Fine Arts & Crafts Guide to Properties of Oil Painting Solvents and Resins Share PINTEREST Email Print Glowimages/Getty Images Fine Arts & Crafts Painting Supplies Basics Lessons & Tutorials Techniques Drawing & Sketching Arts & Crafts By Marion Boddy-Evans Marion Boddy-Evans is an artist living on the Isle of Skye, Scotland. She has written for art magazines blogs, edited how-to art titles, and co-authored travel books. our editorial process Marion Boddy-Evans Updated February 22, 2019 Solvents are added to oil paints to temporarily change the way they work and are designed to evaporate evenly and totally as the oil paint dries. (Technically, the correct term is diluents, as not all are solvents, but it's not the term commonly used.) Solvents are also used to dissolve resins, making mediums, cleaning up, and for cleaning brushes. It is essential to use solvents in a well-ventilated room and remember that they are flammable (catch fire easily). Oil Paint Solvents and Resins Turpentine: Turpentine is the traditional solvent used in oil painting. It's based on tree resin and has a fast evaporation rate, releasing harmful vapors. It can also be absorbed through healthy skin. Use only artist quality turpentine as the industrial variety you find in hardware stores probably contains impurities; it should be colorless, like water. Also known as the spirit of turpentine, oil of turpentine, genuine turpentine, English turpentine, distilled turpentine, double rectified turpentine, or simply turps. Mineral Spirits: Mineral spirits is based on petroleum and has a moderate evaporation rate, releasing harmful vapors. It is said that healthy skin doesn't absorb it, but it's sensible to take precautions, especially if you've sensitive skin. Mineral spirits is less expensive than turpentine. Some people react less to mineral spirits than to turpentine. Mineral spirits is a stronger solvent than odorless mineral spirits. Also known as white spirits. Odorless Mineral Spirits: Odorless mineral spirits is based on petroleum and has a moderate evaporation rate. It is said not to absorbed through healthy skin, but it's sensible to take precautions, especially if you've sensitive skin. Odorless mineral spirits are, unsurprisingly, more expensive than standard mineral spirits as it has had some of the harmful aromatic solvents removed. Brands include Turpenoid, Thin-ex, Gamsol. Citrus-Based Thinners: Despite the more pleasant smell of citrus-based thinners, don't just assume they don't give off any harmful vapors — check what the product is made from. Look for something like Zest-It, which is made from food-grade citrus oil combined with a non-toxic, non-flammable solvent. (Of course, if you get migraines from oranges, this would not be a good thing to use!) Alkyd-Based Mediums: If you want to speed up the drying time of your oil paint, consider using an alkyd-based medium such as Liquin (W&N) or Galkyd (Gamlin). Tip for Testing Oil Paint Solvents Test the quality of a solvent by putting a little on a drop of paper and letting it evaporate. If it doesn't leave any resident, stain, or smell, it should be good enough for oil painting. Resins Resins are used to increase the gloss of oil paint, reduce the color and drying time of a medium, and add body to drying oils. The most commonly used is a natural resin known as Damar, which should be mixed with turpentine as it will not thoroughly dissolve when mixed with mineral spirits. Damar can also be used as a varnish.