What is Light? A Brief History of Light and Its Behavior


Editor’s note: Light impacts the way we view the world and each other. It interacts with skin and hair, reflecting and refracting to impart various effects—benign and otherwise. It also influences the products you develop, both in their package and on your consumers. This primer on light reviews the fundamentals of photophysics, to enlighten cosmetic scientists with the underlying behavior and makeup of this natural force.

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