GOLDEN Mediums offer artists infinite control of changing acrylic colours. Use Mediums to control transparency, viscosity, and surface sheen. GOLDEN Mediums can be thought of as colourless paints, as they are composed of similar polymers that the acrylic paints are. They are the "glue" or binder that dry to form continuous, durable films. They are made of 100% acrylic polymers, which have proven to have excellent flexibility and chemical, water, and ultraviolet radiation resistance.