The hair characteristics to assess in a pre-perm analysis are porosity, elasticity, texture and:

• A. Density
• B. Color
• C. Length
• D. Pattern

Answer: (A)

Before a perm, you’re predicting how the hair will respond to chemical processing by checking porosity, elasticity, texture, and density. Porosity shows how easily the cuticle allows solutions to enter, so high-porosity hair can overprocess while low-porosity hair may resist processing. Elasticity reveals strength and how much a strand can stretch and recover without breaking, guiding how aggressive the chemical service can be. Texture refers to the hair’s diameter (fine, medium, coarse), which affects how wraps sit and how quickly solutions penetrate. Density, the number of hairs per square inch on the scalp, determines how much product is needed, how many wraps you'll use, and the overall processing time. Among the choices, density best completes the set because it directly influences application and timing of the perm ingredients. Color, length, and pattern don’t define the chemical processing behavior in a pre-perm analysis.