In permanent waving, the curl shape is determined by the shape and type of rod and which additional factor?

• A. The processing time
• B. The humidity level
• C. The wrapping method
• D. The solution strength

Answer: (C)

The way hair is wrapped around the rod sets the curl pattern. The rod’s shape and diameter give you a starting curl size, but the wrapping method—how you wrap, the angle, direction, and base placement—all determine the final curl shape you’ll see. Different wrap techniques change how the hair fibers are laid on the rod: for example, a spiral wrap tends to produce longer, looser curls, while a full croquignole wrap creates tighter, more uniform curls. The base position (on-base, half-off-base, or off-base) also affects lift and volume, influencing the overall look of the curl.

Other factors like processing time, solution strength, and humidity can affect how well the curl forms, its hold, and how durable it is, but the wrap method is the primary factor that defines the curl’s shape.