An Alloy is a mixture of metals or a mixture of a metal and another element. Alloys are defined by a metallic bonding character.  An alloy may be a solid solution of metal elements or a mixture of metallic phases.

Acids and bases are chemicals that are dangerous to human tissue. They may cause chemical burns, respiratory distress and fire hazards. The safety hazards are more serious when working with concentrated forms of acids and bases, but injuries can occur even with dilute solutions.