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[ReneZ]

There was a fire in the building complex including the Collegium Romanum in 1849.
One book acquired by Voynich, a Corvinate that is now in Budapest, has fire damage.

Several items in the Jesuit collection and at least one more acquired by Voynich (You are not allowed to view links. Register or Login to view.) have visible water damage,
but it is of course not certain that this is related to fire extinction activities from that time...

This is documented in: Pócs, Dániel: Egy corvina története. Battista Spagnolli Mantanovano: Pathenice Mariana (Pontosításokkal a Pierpont Morgan Library M496 és M497 jelzetü corvináinak provenienciájához). In: arshungarica 43 vol.3, 2017, pp.301-354. (You are not allowed to view links. Register or Login to view.).

Here is a somewhat older Google translation of the relevant part:

Knowing the origin of the Battista Mantovano Code, it is already easy to find out when the manuscript was burned: on the top floor of the Collegium Romanum building on August 7, 1849, at eight o'clock in the morning, a small fire, presumably caused by the French troops arriving there. Even though the firefighters arrested curbed the rapidly spreading flames, the material of the Bibliotheca Maior and the Museo Kircheriano remained essentially intact, but several rooms were burnt out and serious damage was also caused in the Sant'Ignazio church. In this fire, several books and codes have been damaged, and this can be seen in some of the manuscripts in the Vatican Library, as well as archival sources that later emerged from the library material about the damage caused by the books.