| http://www.w3.org/ns/prov#value | - The resultant surface is then treated with a solution comprising a solvent and at least one adhesion-promoting agent selected from the group consisting of N-phenylglycine (NPG) and derivatives and analogues thereof, and other amino acids in the form of salts and complexes of these compounds with at least one species of divalent or polyvalent cation, or diamine or polyamine, wherein the divalent an
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