Acids are widely used in professional skin care. This comprehensive seminal will address the relationship between PH and the strength of acids. Understanding the concepts behind percentages, buffering and PK values will take your results to the next level. Dive into the benefits and drawbacks of lactic, glycolic, salicylic, and mandelic acids and the physiological responses to their application. This class is a must for all professionals from beginner estheticians to seasoned professionals.