Which is a common sign that a tool has been improperly disinfected?

Visible debris is a common sign that a tool has been improperly disinfected because effective disinfection should eliminate not just harmful microorganisms but also any organic matter such as skin cells, dust, or product residue. If there is visible debris, it indicates that the disinfection process was inadequate, as those remnants can harbor bacteria and other pathogens, undermining the safety and cleanliness of the tool. This is crucial in the context of lash application, where proper hygiene standards must be upheld to prevent infections or allergic reactions in clients.

The presence of shiny surfaces might indicate that a tool has been properly cleaned, while a soft texture or uniform color does not specifically relate to the process of disinfection. Therefore, the unmistakable presence of visible debris is the key indicator of improper disinfection.