A 20 volume hydrogen peroxide solution will generally lift the hair:

A 20 volume hydrogen peroxide solution will generally lift the hair:

• A. Two levels
• B. Three levels
• C. Four levels
• D. Five levels

Answer: (A)

Understanding how developer strength affects lifting is key. A 20-volume hydrogen peroxide developer is considered moderate in strength, giving a modest lift rather than a strong one. On virgin hair, this typically lightens enough to move the shade slightly, but it’s not a dramatic change. The exact result can vary with starting color, hair porosity, processing time, and the specific product formula, but the general expectation is a light, controlled lift with this volume. Higher volumes lift more, while lower volumes lift less, so the moderate lift you’d get from 20-volume matches the correct choice.

Understanding how developer strength affects lifting is key. A 20-volume hydrogen peroxide developer is considered moderate in strength, giving a modest lift rather than a strong one. On virgin hair, this typically lightens enough to move the shade slightly, but it’s not a dramatic change. The exact result can vary with starting color, hair porosity, processing time, and the specific product formula, but the general expectation is a light, controlled lift with this volume. Higher volumes lift more, while lower volumes lift less, so the moderate lift you’d get from 20-volume matches the correct choice.