Art spectrum studio oil is a secondary range called art prism. Art prism is a one series range of 26 oil colours. All colours are made to the same exacting standards and methods as our professional art spectrum finest artists' oil colours. This studio oil range has a buttery consistency and provides a balanced palette capable of producing almost unlimited clean colour mixes. All colours are lightfast and on toxic and can be used together with art spectrum finest artists' oil colours, mediums and varnishes.