At the end of the 19th century, when he developed oil colours for his artist customers who would include immortal names like Cézanne, Gauguin and Picasso, Gustave Sennelier recognized the need for producing paints that only contained the highest quality pigments. In order to craft superior colours, Gustave verified that the origins of the pigments were from selected traditional sources, while precisely identifying their specific chemical characteristics. Ultimately, his great respect for these materials not only insured the permanence of works created with his paints, but also assured the production of an increasing array of unique colours of unsurpassed beauty and quality.