What do they look like?

Thermometer
© The Board of Trustees of the Science Museum

A set of fraudulent dice, some weighted with drops of mercury inside, 15th century
© Museum of London

Beaver felt riding top hat, c.1864
© Museum of London

Packet of mercurous chloride tablets
© The Board of Trustees of the Science Museum

‘V-Packette’ venereal disease preventative treatment kit
© Imperial War Museum

Fire sprinkler head with metal sphere filled with mercury (which ruptured on heating, releasing the water), c.1900
© The Board of Trustees of the Science Museum

Mercury electrical switch
© The Board of Trustees of the Science Museum

Herbarium specimen sheet
© Larry Carr