Test to evaluate quality of steel

This requires the immersion of the instruments in a chemical solution consisting of Copper Sulphate (CuSO4-5H20) 4g, Sulfuric Acid (H2SO4) 10g, and distilled water 90ml. The instruments should be thoroughly scrubbed with soap and water, followed by immersion in 95% Ethyl Alcohol. It should then be immersed in the Copper Sulphate solution for 6 minutes at room temperature. The Copper Sulphate solution will react with any free iron on the surface of the instruments, and plate out copper on them, any reddish discoloration of the surface indicates that the composition of the metal is not of a surgical grade.