Resins-based mediums are those made with resin dissolved in a solvent, such as dammar spirit varnish (dammar or damar in turpentine), mastic spirit varnish (mastic gum dissolved in turpentine) or megilp (oil and resin based medium and later Maroger mediums) added to oil paint. Resin-based mediums and varnishes have become popular additions to oil paint since the nineteenth century.
Aside from picture varnishes, the major use of resins in oil paintings were glazes. The use of resinous mediums in oil paint is certainly not new. Researchers have found natural resins, such as mastic and, more commonly, those from pine trees, in the earliest European oil paintings of the fifteenth century. However, the use of natural resins in oil paint was confined to specific passages of paintings. It was not until the latter half of the eighteenth century do we find paint films incorporating resins throughout paintings.Read More