The article contains a survey of the state of knowledge about the additional tanning and currying of old leather, with particular attention paid to book bindings; both operations are regarded as the most important in the entire process of conservation. The authors present a lucid classification of plant tanning agents and their role in leather dressing as well as a characteristic of tanning extracts. Further topics include moellens used for dressing old leather and a number of recipes for the production of assorted mixtures. Finally, the authors describe in detail the principles of the additional tanning of leather book bindings and dressing with emulsions and solvents.
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