vision - Why do objects of a given color appear white under light

Under light from the sun, a red object will scatter the red component of light, and absorb all others. Hence, the human eye perceives it as "red". White objects scatter all wavelengths of light.

The Chemistry of Light & Color

Why Objects have Colors - Illustration - Animation

PANTONE® USA How Do We See Color?

White Light Colors, Absorption & Reflection - Lesson

Science of Light - Night Skies (U.S. National Park Service)

The Color of Light

Blue Light: What Is It, and How Does It Affect Our Eyes?

Molecular Expressions: Science, Optics, and You: Light and Color - Primary Colors

How We See Color American Museum of Natural History