Which type of hair requires a more alkaline solution for permanent waving?

Coarse hair requires a more alkaline solution for permanent waving due to its inherent structure and texture. Alkaline solutions, typically with a higher pH, help to swell the hair shaft and open up the cuticle layer, allowing the waving solution to penetrate more effectively. Coarse hair tends to be more resistant to chemical changes, so a stronger alkaline solution is necessary to break down the disulfide bonds in the hair. This allows for the creation of curls or waves that hold well.

When considering hair texture, fine hair generally requires a milder solution because it can be more easily damaged by harsh chemicals. Medium hair sits in between requires moderate solutions that balance between strength and gentleness. Curly hair may not necessarily require more alkaline solutions, as its wave pattern is already established and can often hold curls better when less aggressive solutions are used. Therefore, coarse hair is the most suited for more alkaline solutions in the context of permanent waving.