| http://www.w3.org/ns/prov#value | - pyridine.The compositions of this invention are suitable for use as pigments for colouring high molecular organic material.Examples of high molecular organic materials which may be coloured or pigmented with the compositions of this invention are cellulose ethers and esters such as ethyl cellulose, nitrocellulose, cellulose acetate, cellulose butyrate, natural resinsor synthetic resins such as po
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