Getting the right hair coloring takes more than Just application it takes knowledge of hair color ingredients and how the function , yes many people get lucky or someone might be able to maintain your previous work but not for long . I have always said that a great color takes tine and patience you cannot rush a product that is intended to work at a certain level of time . Some may use heat dryers to rush the bleaching action when using bleach but all this does is dry the hair out more causing more problems in the long run. 
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Hair COLORIST Martin Rodriguez 