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Hair Structure and Chemistry Simplified, Fifth Edition is the most current, comprehensive and straightforward textbook of its kind. This new edition thoroughly explains the theory and application of the essential concepts of hair chemistry that are simply not covered in other texts. Material unique to this text boldly presents the concept, importance and relevance of pH in cosmetics. Hair Structure and Chemistry Simplified is the essential chemistry textbook for cosmetology students and even the most experienced hairstylist will gain confidence and control as they learn the dynamics of the chemical services they perform everyday in the salon. Consumers will find this reference invaluable in making intelligent, informed decisions about the effectiveness, safety, and value of the hair care services they receive and the products they buy and use. - from Amzon