Which of the following will not cause an article to be adulterated?

An article, such as a drug or food product, is considered adulterated if it fails to meet the standards of quality, strength, or purity established by the Food and Drug Administration (FDA). The correct answer is that containing a color additive not labeled properly does not in itself cause an article to be considered adulterated under the general definitions of adulteration.

Adulteration typically focuses on the overall integrity and safety of the product, rather than specific labeling issues. While improper labeling, such as not disclosing the presence of a color additive, can lead to misbranding violations, it does not inherently compromise the quality or purity of the article being assessed.

In contrast, being stored in unknown conditions poses a significant risk to the product’s integrity and can lead to contamination or degradation, making the product adulterated. Mixing a product with another substance that reduces its quality is also a clear case of adulteration, as it directly affects the product's purity and effectiveness. Therefore, the other options clearly represent scenarios that compromise the standards governing the safety and quality of a product, whereas the presence of an improperly labeled color additive does not meet that same threshold.