Why might older preserved specimens pose a risk when touched by the public?

• A. They are harmless regardless of preservation.
• B. It is a good idea to let someone touch preserved specimens.
• C. Older specimens were preserved with arsenic and could be a danger to the public.
• D. Touching mounts extends their longevity.

Answer: (C)

Older preserved specimens can pose a chemical hazard because many were treated with arsenic-based preservatives to deter pests and preserve tissue. Arsenic compounds are toxic to humans, and contact through skin or inhalation of dust can lead to harm, even with long-term or repeated exposure. When the public touches or handles such mounts, arsenic residues can be transferred to hands, and then to mouths or eyes, increasing the risk, particularly for children. Because of this danger, facilities typically restrict public handling and use protective measures like gloves and barriers to prevent exposure. Not all older specimens are hazardous, but the possibility of arsenic-based preservation makes touching them a real safety concern. The other options imply there’s no risk, encourage handling, or claim handling improves the specimen’s longevity, which doesn’t align with how these materials behave or with safety practices.