| http://www.w3.org/ns/prov#value | - The method of printing which comprises applying to a surface characterized by high ionizing power a substantially colorless liquid, said liquid comprising a substantially colorless associated salt wherein the anion is an organic sulfinic acid anion and the cation is a colored dye cation of an arylmethane dye base characterized by a logarithmic dissociation constant below 7, whereby physical contac
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