California State Board Barber Practice Exam

Hair porosity refers to the hair's ability to absorb and hold moisture. This is an important factor in hair care, as it determines how easy it is for the hair to retain moisture and stay hydrated. Option "B Heat" is incorrect because porosity does not refer to the hair's ability to hold heat. Option "C: Color" is incorrect because porosity does not affect the hair's ability to hold color. Option "D: Products" is incorrect because porosity does not refer to the hair's ability to hold products, but rather moisture. This is why option "A: Moisture" is the correct answer.