Corrosion is the reaction of a metal with another material. These reactions are usually with very low PH or acidic materials such as sulphuric acid or reactions with high ph or basic materials such as sodium hydroxide.
... of the Bayeux Tapestry)
Buckinghamshire
Bletchley Park Museum[?] (Enigma machine)
Cambridgeshire
Fitzwilliam Museum[?], Cambridge
Cornwall
Barbara Hepworth ...