| http://www.w3.org/ns/prov#value | - Suitable printing ink formulations are known to the skilled worker, and generally comprise from 5 to 20% by weight of pigment, such as diazo pigments or phthalocyanine pigments, from 5 to 15% by weight of polyvinyl acetal binder, and solvent, for example alcohols such as ethanol, or esters such as ethyl acetate.
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