| http://www.w3.org/ns/prov#value | - The dome stain (pre-) treatment may be omitted or further used in the process according to the invention, e.g. further used by applying an aqueous composition containing at least one phosphonate or phosphonic acid or both, especially at least one phosphonate or at least one phosphonic acid having an alkyl chain in the middle of the molecule, preferably of an alkyl chain with 4 to 40 or with 6 to 3
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