Antiques and mercury.

Careful with that antique clock:

"The silvery, skittering, and toxic liquid can be found in some antiques. Mirrors can be backed with mercury and tin; clock pendulums might be weighted with embedded vials of mercury; and barometers, thermometers and lamps may have mercury in their bases for ballast.

The problem is that mercury in old items can leak, particularly as seals age or when the items are moved, according to a study by the Centers for Disease Control and Prevention."

[mercury] [antiques] [barmoters] [poison]