When adding natural highlights to brunette hair, what is the maximum number of levels the highlighted pieces should be lightened above the balance of the hair? 

What do cosmetologists use to identify the degree of darkness or lightness of natural and artificial hair color? 

Which of the following accurately describes a step in the process of mixing and applying haircolor? 

Which hair type will take the longest to process? 

A bacteria produces beta-lactamases. Which of the following antibiotics would be most effective?

Cosmetologists should recommend that clients take which of the following steps to preserve moisture after a soft curl perm? 

A client who is considering a chemical relaxer service frequently consumes highly caffeinated beverages. Why does this matter? 

For which of the following patients is Arestin contraindicated?

Which of the following local anesthetics may be combined for injection-free local anesthesia (Oraqix)?

Which of the following local anesthetic agents have the potential to cause methemoglobinemia as an adverse effect?