Final answer:
The comb used in a thermal styling service is generally made of hard rubber or thermal-resistant plastic, which can withstand high temperatures without melting or conducting electricity.
Step-by-step explanation:
The comb used in a thermal styling service is usually made of materials that can withstand high temperatures, such as hard rubber or a thermal-resistant plastic. When using a comb for styling with heat, it's essential that the comb does not melt or conduct electricity; hence, materials like metal are not suitable for this purpose. Similarly, the concept of excess electrons is related to the electric charge that objects can acquire, as evidenced by a comb that, after being used to comb hair, can attract small strips of paper due to the buildup of static electricity.
In the context of perms, the application can be either thermal or chemical. Unlike chemical perms that use chemicals to alter hair structure, thermal styling involves direct heat. It's important for the tools in thermal styling, like combs, to be made from materials that resist this heat and do not contribute to any unwanted chemical reactions. Hence, hard rubber combs are a common choice because they can withstand the heat without transferring excess electrons to the hair.