Final answer:
The permanent wave wrapping technique where hair is wrapped from the ends to the scalp in overlapping concentric layers is the Croquignole wrap. It creates varying tightness of curls and lasts several months due to the alteration of disulfide bonds in the hair.
Step-by-step explanation:
The permanent wave wrapping technique where hair is wrapped from the ends to the scalp in overlapping concentric layers is known as the Croquignole wrap. This method involves winding the hair onto perm rods from the ends toward the scalp, typically creating a tighter curl at the ends and a looser curl near the scalp. The permanence of this hairstyle results from the disruption and reformation of disulfide bonds within the hair, a process that can involve the application of chemicals to the hair before it is wrapped around the forms.
Unlike a temporary wave, which relies on water molecules disrupting hydrogen bonds until the hair is dried into a new shape, a permanent hairstyle (or perm) can last for several months due to its alteration of disulfide bonds. The permanent wave wrapping technique where hair is wrapped from the ends to the scalp in overlapping concentric layers is called the Croquignole wrap. This technique is often used in cosmetology to create curls or waves that last for several months. The Croquignole wrap involves wrapping the hair around a perm rod from the ends to the scalp, resulting in a tight curl pattern.