In permanent waving, which two factors determine the shape and type of curl?

• A. Color of dye
• B. Shape and type of rod and wrapping method
• C. Hair length
• D. Condition of scalp

Answer: (B)

In permanent waving, the curl's shape and type come from the shape and type of the rod and the wrapping method. The rod acts as a mold for the curl: its diameter determines how tight or loose the curl will be—smaller diameters give tight curls, larger diameters give looser waves. The wrapping method is about how the hair is wound around the rod and how the ends are secured. This affects curl direction, texture, and uniformity: different wraps (like spiral versus straight/ends) produce distinct patterns and densities. Together, these two factors set the final curl effectively, while factors like dye color, hair length, or scalp condition don’t determine the curl pattern itself.