Why is exposed copper or white metal undesirable in pasteurization equipment?

The correct answer highlights an important concern in the context of pasteurization processes. Exposed copper or white metal can indeed dissolve into the milk during pasteurization, potentially leading to contamination. Copper, for example, can react with certain compounds in the milk, creating soluble copper salts that can affect the quality and safety of the milk. The presence of these metals in the final product is undesirable as they can cause off-flavors, discoloration, and even health risks to consumers.

In the pasteurization process, maintaining the integrity of the equipment is critical. Using materials that can leach into the product not only compromises milk quality but also undermines the effectiveness of pasteurization by introducing foreign substances into the milk.

Understanding this context emphasizes the need for proper maintenance and the use of appropriate materials in the construction of pasteurization equipment to ensure both safety and quality in dairy production.