Which of the following is a sign that a nail product may have gone bad?

A nail product that may have gone bad can show several key indicators, and all of the options listed—change in color, unpleasant odor, and separation of layers—are significant signs that help in identifying product spoilage.

A change in color can indicate that the formula has degraded, which might affect not only the aesthetic quality of the product but also its effectiveness. Products may shift in color due to exposure to air, light, or temperature changes that compromise their integrity.

An unpleasant odor is another warning sign. Most nail products have a characteristic scent, and if they begin to smell sour or otherwise off, it often signals that the product has gone rancid or that chemical reactions have altered its composition.

Lastly, the separation of layers suggests that the product is no longer stable. Many nail products contain various components that should remain well-mixed for optimal performance. A distinct separation indicates that ingredients may have broken down, resulting in an ineffective or unusable product.

Recognizing these signs is essential for nail technicians, as using compromised products can lead to adverse effects on both the technician and the client. Hence, all of these are valid reasons to discard a nail product and ensure safety and quality in nail care services.