The solution detects both Fe²⁺ ions and hydroxyl ions. Formation of Fe²⁺ ions and hydroxyl ions are indicated by blue and pink patches respectively.

Prevention

Because of the widespread use and importance of iron and steel products, and because rusting severely compromises the strength, functionality and the appearance of such products, the prevention and control of rust is the basis of major economic activities in a number of specialized technologies. A brief overview of methods is presented here; for

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