While many textbooks focus purely on the chemistry of mixing ingredients, Harry's dedicates significant space to the psychological and physiological experience of a product. This includes:

Harry's Cosmeticology is a seminal textbook in the field of cosmetic science, providing a comprehensive understanding of the principles, formulations, and applications of cosmetic products. Its significance and relevance have endured for several decades, making it a trusted resource for professionals, students, and researchers in the cosmetic industry.

The title page read: A Compendium of Cosmeticology, or the Art of the Necessary Mask. Compiled by H. S., 1842.

In the elevator, a senior partner he’d never met said, “You know, you have a very trustworthy face.”