Which type of staining can result from leaving detergents on the instrument’s surface?

• A. Brown stains
• B. White stains
• C. Black stains
• D. Red stains

Answer: (C)

Leaving detergents on an instrument's surface can lead to the development of black stains. This phenomenon occurs because some detergents, particularly those containing phosphates and other chemicals, can react with certain metals commonly found in surgical instruments. This reaction can result in tarnishing or oxidation, leading to a discoloration that appears black.

The formation of these stains highlights the importance of proper cleaning procedures and rinsing techniques when handling surgical instruments. Residual detergent left on the surface can not only cause aesthetic issues but can also impact the instrument's functionality and longevity. Ensuring that all cleaning agents are thoroughly rinsed off helps prevent such staining and maintains the integrity of the instruments.