NIC Barber Written (Theory) ExamHair Care ServicesMedium
A barber is performing a permanent waving service. After the waving solution has been applied and processed, the hair is thoroughly rinsed. What is the primary purpose of applying the neutralizer (thio neutralization) immediately after rinsing?
- ATo remove excess perm solution and prevent over-processing.
- BTo break more disulfide bonds for a stronger curl.
- CTo re-harden the hair by rebuilding the disulfide bonds.
- DTo swell the hair and open the cuticle.
Show answer & explanationAnswer & explanation
Correct answer: C. To re-harden the hair by rebuilding the disulfide bonds.
The primary purpose of the neutralizer in a permanent waving service (specifically thio neutralization) is to re-harden the hair by chemically rebuilding the disulfide bonds in their new, curled position. This locks the hair into the desired wave pattern and stops the action of the waving solution.
Why the other options are wrong
- A. Rinsing removes excess perm solution; the neutralizer's role is chemical rebuilding, not just removal.
- B. Breaking disulfide bonds is the function of the waving solution; the neutralizer rebuilds them.
- D. Swelling the hair and opening the cuticle is the function of the waving solution, not the neutralizer.
Neutralizer Function (Permanent Waving)
The chemical process, typically using an oxidizing agent, that re-forms and hardens the disulfide bonds in the new, desired curl pattern after the waving solution has broken them.
- Typically hydrogen peroxide or sodium bromate.
- Stops the action of the waving solution.
- Locks the hair into its new shape.
Memory trick: Waving breaks, Neutralizer makes (bonds)!