Which trio of properties is used to determine perm timing and solution strength?

• A. Texture, Elasticity, and Porosity-Perm
• B. Color, Density, and Porosity
• C. Length, Curl, and Texture
• D. Shine, Porosity, and Elasticity

Answer: (A)

Understanding perm timing and solution strength relies on reading three hair properties: texture, elasticity, and porosity. Texture tells you how coarse or fine the hair is, which affects how quickly chemicals can penetrate—coarser hair generally needs more time or a stronger solution than finer hair. Elasticity reflects how well the hair can stretch and recover, giving insight into its health and resilience; more elastic, healthy hair tolerates processing better, while hair that is brittle or overly pliable may require adjustments to timing and neutralizer strength. Porosity shows how readily the hair takes in moisture and chemicals; highly porous hair absorbs solutions quickly and is often more fragile, so you might use a shorter processing time or milder solution, whereas low porosity hair resists penetration and may need longer processing or a different approach to reach the desired curl. Together, these properties predict how fast the chemical will work and how much strength is needed to achieve the curl without causing damage. Other factors like color, density, or shine don’t directly determine processing behavior in a perm.