Massachusetts Board of Cosmetology Practice Exam

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What affects the working time of a lightener?

Porosity of the hair
Type of developer used
Amount of melanin present
Temperature of the scalp

The correct answer is: Amount of melanin present

The amount of melanin present in the hair affects the working time of a lightener. Lighteners work by breaking down the melanin in the hair, which is responsible for its natural color. Therefore, the more melanin present, the longer it will take for the lightener to lift the hair to the desired level. The other options may also play a role in the lightening process, but they do not directly affect the working time of the lightener. For example, the porosity of the hair and the type of developer used can affect how quickly the lightener will process, but they are not the main determining factor. The temperature of the scalp is important to consider as it can affect the health of the hair, but it does not have a direct impact on the working time of the lightener.