Two disadvantages of metal are:
1) Rusting: When metals are exposed to moisture, they can rust. Rust is formed when metal reacts with oxygen from water in the air. This can lead to deterioration of the metal and affect its structural integrity. Copper and bronze, for example, turn green when they rust.
2) Expense: Some metals can be very expensive. This can make them less accessible or affordable for certain applications or industries. The cost of metal can be a limiting factor in various projects or manufacturing processes.
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