Besides porosity, which of the following is NOT a factor that influences processing time?

• A. Hair length
• B. Elasticity
• C. Density (thickness)
• D. Previous chemical history

Answer: (B)

Processing time in chemical texture services is driven by how quickly the chemical can penetrate the hair and react in the cortex. Porosity directly affects this because hair with higher porosity allows faster chemical penetration, leading to a shorter processing time, while low porosity slows penetration and lengthens it. Hair length matters because longer strands require more time for the chemical to diffuse from the midshaft to the ends. Density (thickness) influences how much hair there is to treat; more hair or greater density means more material to penetrate, which can extend processing time. Previous chemical history is relevant because previously treated hair has altered bonds and cuticle structure, changing how the chemical reacts and how long it should process to achieve the desired result. Elasticity, on the other hand, describes how well hair can stretch and recover and does not determine the rate of chemical penetration or reaction, so it does not influence processing time.