Effect of water on gelatine-sized rag paper (18th, 19th century, and modern printing paper)

Gelatin-sized rag paper is a type of paper that has been treated with gelatin to make it more resistant to water. This type of paper was commonly used for printing and artistic purposes in the 18th and 19th centuries.
When water comes into contact with gelatin-sized rag paper, the gelatin molecules swell and make the paper more water-resistant. However, if the paper is exposed to too much water, the gelatin molecules can start to break down, which can cause the paper to become weak and brittle.
The effect of water on gelatin-sized rag paper depends on a number of factors, including the type of gelatin used, the amount of gelatin used, and the way in which the paper was sized. In general, however, gelatin-sized rag paper will become more water-resistant as it ages, but it will eventually start to break down if it is exposed to too much water.
Credit: The video illustrates concepts concerning the interaction of paper and water that are discussed in the book of Paper and Water
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