1.   Acid can corrode most metals.

2.   Metal is easily corroded, but the skill lies in producing an attractive colour which is even in tone and texture.

3.   Salt corrodes metal.

4.   A. Synthetic fertilizer contains chemicals such as nitrates and potash, all corroding the metal, freezing up the wheels.

5.   The plasticizer itself breaks down into an acidic product and deteriorating PVC produces hydrogen chloride gas, which corrodes metals, her research has shown.

6.   With each passing year, the job becomes more complicated and dangerous because the concealed, corroding metal becomes more volatile and ready to blow if jostled.