How should liquid cosmetics be stored?

Liquid cosmetics should be stored in properly labeled closed containers to maintain their integrity and ensure safety. Proper labeling helps to identify the contents easily, which is crucial for avoiding cross-contamination and ensuring that products are used correctly. Closed containers prevent exposure to air and contaminants, reducing the risk of spoilage and contamination, which can compromise the product's quality and effectiveness. Additionally, secure storage minimizes the chances of spills and leaks, enhancing overall safety in both personal and professional use within the cosmetology setting.

Options suggesting unmarked or open containers do not provide the necessary protection or identification for the products. Storing liquids in glass bottles only is overly restrictive, as many effective and safe cosmetic products are available in various materials, including plastic. The focus should be on proper labeling and closure rather than material restrictions.