HAZARDOUS BINDINGS - CELLULOID / IVORINE BINDINGS

Cellulose-nitrate was used to form hard 'artificial ivory' material used for the covers of some late nineteenth-century US and European decorative, gift books, albums, and religious books. Often used under its trade names of Celluloid, Ivorine, or French Ivory, as it degrades the material is sometimes unstable, can off-gas acidic compounds that affect adjacent materials, and is highly flammable, also releasing toxic gases as it burns. Considered hazardous by some common carriers, there may be restrictions on shipping the material. 

Celluloid / Ivorine handling and safety

https://celluloidsheet.com/faq-items/is-celluloid-flammable-what-safety-precautions-should-be-taken-during-its-use-and-storage/

The example images show the decorated recto, smooth verso, and coggled edges of a celluloid or ivorine binding.