When using only part of a cosmetic preparation, how should it be removed?

The correct choice emphasizes the importance of maintaining hygiene and preventing contamination when handling cosmetic products. When using only part of a cosmetic preparation, it is crucial to avoid introducing bacteria or other contaminants into the remaining product. This is accomplished by ensuring that the method of removal does not compromise the integrity of the unused portion.

Using clean hands is not specifically protective against contamination from bacteria that might already be present. A dirty spatula and a used applicator are both inappropriate choices, as they increase the risk of transferring harmful microorganisms into the product. The primary goal is to keep the untouched portion safe and usable, which reinforces the necessity of employing proper sanitation practices. Ensuring that the remaining product is free from contamination is vital for both safety and effectiveness in cosmetic use.