Which item is NOT a factor affecting sanitizing?

• A. Contact time
• B. Concentration
• C. Temperature
• D. Color of packaging

Answer: (D)

Sanitizing effectiveness depends on how long the surface is exposed to the sanitizer (contact time), how concentrated the sanitizer is (concentration), and the temperature at which it is used. These factors govern how thoroughly the active agents can interact with and kill microbes. If any of these are inadequate—too little contact time, too low a concentration, or an unsuitable temperature—the sanitizer won’t work as well. The color of packaging does not influence the chemical activity of the sanitizer or how long it contacts the surface, so it isn’t a factor in sanitizing performance.