Oil Painting Mediums alter the working properties of paint. Although called “mediums,” mediums typically are composed of a binder and sometimes a solvent. Additives, on the other hand, consist of solvents, oils, waxes, resins, extender pigments and other substances that are used to change the consistency of paint. Here you will find oil panting additives (or as Natural Pigments prefers to call them “amendments”). These amendments are designed to alter the consistency of oil paint in novel ways, different from the varnishes that were introduced into common use during the 19th century. Painting amendments change the handling properties of paint, such as flow out and leveling; increase or decrease tackiness and drag; hasten or retard drying time, increase or decrease gloss, increase transparency, or other characteristics.