| http://www.w3.org/ns/prov#value | - ogically acceptable medium is preferably a medium which dissolves the colouring material precursors. [0125] Of the solvents for the precursors suitable for the formulation of the compositions according to the invention mention may be made of water, alcohols, polyol ethers and their mixtures. [0126] Of these solvents, mention may be made, as examples, of the C1-C4 lower alkanols such as ethanol and
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