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

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

Answer: (A)

In a pre-perm analysis, you’re evaluating how the hair will respond to chemical processing by considering porosity, elasticity, texture, and density. Density refers to how many hairs are packed per square inch on the scalp. It’s crucial because it shapes how you wrap the hair, how much product you’ll use, and how evenly the chemical processes the strands. High-density hair has more strands to process, which can require more product and careful spacing to avoid overprocessing, while low-density hair needs less product and may process more quickly.

The other factors aren’t used as separate planning criteria for perms: color reflects pigment, which isn’t a direct predictor of chemical behavior in wrapping and processing; length doesn’t alter how the cortex reacts to waving solutions; shine is a surface characteristic tied to porosity but isn’t a standalone planning parameter. So the missing characteristic to assess alongside porosity, elasticity, and texture is density.