Mummified human and animal remains have long been in demand among collectors, and such items are sufficiently rare that their acquisition may involve unregulated, occasionally clandestine trade practices—if not outright illegal ones. According to the authors of a paper published in the International Journal of Cultural Property, the risks to would-be collectors aren't just legal. Mummified remains may also pose a significant health hazard due to toxic substances used in their preservation and microbial growth due to improper storage. In fact, toxic spores or fungi are often cited as the source of the legendary "mummy's curse" tied to the excavation of King Tutankhamen's tomb.

Per the authors, the mummification process throughout history has relied on various toxic materials and substances to help preserve the remains—heavy metals like arsenic, mercury, and lead, for example—which is why careful handling is necessary to avoid adverse health effects. (Professionals typically don masks, gloves, and lab coats when working with such remains.) Various micro-organisms (bacteria, fungi, yeasts) can also lie dormant in the tissues for centuries and can recolonize and multiply due to a ready…