Dr. Hayel Said
Founder and Senior Chemist, L’Avant Garde, Inc.

Dr. Said received his PhD in Molecular biology from the University of Southern California, Los Angeles. He has over 24 years of professional formulation expertise in hair care products and chemical reactive treatments including all forms of hair color. He holds 4 United States Patents, and several international patents, and has published many scientific articles (see profile).

Click on question:

• How many types of hair tint removers are there, and how do they work?
• Does cream peroxide act as a conditioner during the coloring process?
• Can I change a permanent alkaline hair color into a deposit-only hair color by using a special developer?
• The bleach that I use states that I should not use a metallic container for mixing. If a metallic bowl interferes with bleaching, why wouldn’t highlighting foils also interfere?
• When coloring resistant gray hair, is it more effective to use extra ammonia or extra peroxide volume?
• What is the difference between semi-permanent and demi-permanent hair colorants?
• Does blond hair have only pheomelanin (yellow and red)? If so, why does it bleach out so easily knowing that pheomelanins are much harder to bleach out than eumelanin (black melanin)?