| 摘要 |
A process for the retanning of iron-tanned leather, comprising applying to iron-tanned leather condensates based on: A) sulphonated aromatics, B) aldehydes and/or ketones and optionally C) one or more compounds selected from the group consisting of the unsulphonated aromatics, urea and urea derivatives for the retanning of iron-tanned leather, with the proviso that the content of naphthalenesulphonic acid/formaldehyde condensate and condensate based on phenol and formaldehyde is less than 25% by weight, preferably less than 5% by weight, based on the total amount of condensate.
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