How is an anode typically marked?

An anode is typically marked red because this color convention helps to easily differentiate between the anode and cathode in electrical equipment. The red color is widely recognized in various fields, including electrical and esthetics practices, to signify positive polarity or the electrode where oxidation occurs. Using red as a marker aligns with standard safety practices, allowing professionals to quickly identify the anode during procedures or when dealing with electrical equipment in esthetic treatments.

In comparison, other colors like black and green typically denote different purposes, such as grounding or negative polarity, which is why they are not used for marking anodes. Blue is not a standard color associated with anodes, and therefore its use in this context would create confusion. Understanding these color codes is essential for safety and effective practice in esthetics and any work involving electrical devices.