Which of the following is NOT a component of a common detergent?

• A. Surface wetting agent
• B. Builder
• C. Coloring agent
• D. Chelating agent

Answer: (C)

In the context of common detergents, a coloring agent is typically not considered a functional component that contributes to the cleaning action of the product. The primary components of detergents include surface wetting agents, builders, and chelating agents.

Surface wetting agents help to reduce the surface tension of water, allowing it to spread and penetrate more effectively, which aids in the cleaning process. Builders enhance the effectiveness of the surfactant by softening water, thus preventing the precipitation of hardness ions, allowing the detergent to clean better. Chelating agents bind with metal ions, which can otherwise interfere with the cleaning process.

Coloring agents may be included in detergents for aesthetic purposes, such as to improve their visual appeal, but they do not contribute to the cleaning efficacy. Therefore, while they may be present in some formulations for marketing reasons, they are not essential components in the function of a detergent.