The higher the number is the stronger the developer is and it therefore more lightens hair. The force/concentration of developer is expressed in percentage (%) or units of volume (Vol.). The choosing the correct developer to use for your desired results is crucial to getting the color you want. How to Choose the Right Volume Developer? This choice will also depend on the type of color, degree of lightening, type of hair and quality of hair. If you want to get the best result, it is important to use the right concentration of developer.
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