Arizona Barber Practice Exam

The correct answer is processing time because it refers to the duration of time that the hair lightening chemicals will remain on the hair before being rinsed out. This is important because the longer the processing time, the more the hair will be lightened. The other options are incorrect. The incubation period, or the time between exposure to the chemicals and the start of the reaction, is not a factor in hair lightening. The pre-disposition test, which is used to determine if someone is likely to develop an allergic reaction to the hair lightening chemicals, also does not affect the lightening process. Lastly, the hair follicle, or the root of the hair, does not play a role in determining how much the hair will be lightened.