Extracted from linseed, this excellent binder provides pastes that are very pleasant to work with, hardens them faster and thoroughly and gives a resistant finish of depth and great beauty. Clear, low acid, despite its tendency to yellow in the dark, refined oil offers the best of linseed oil. It allows for diluting the colour and increases its brightness. Thinner: mineral spirits or turpentine. Diluted in this way, it can be used as a painting medium, however this carries the risk of delaying the drying of the colour and making it "sticky" if used in too large a quantity.