Translations:Addendum II/60/en

Biological damage refers to living organisms such as rodents, insects, fungi, and bacteria that can destroy documents. Some of these, including cockroaches, worms, termites, and ants, consume the paper while breeding in a damp, dark environment. Their presence can be identified by small holes appearing on the pages or by droppings left between the documents. Spores, fungi, and bacteria change the texture of the paper and weaken it. Their presence is evidenced by the appearance of black, reddish, or brown stains on the paper. A magnifying glass can be used to differentiate an acid stain from fungus., Fungi are superimposed on top of the paper and, in some cases, have thin bristles.