Color is a result of the absorption and reflection of light. A shirt appears a color because it reflects that color of light. A shirt appears black when it absorbs all wavelengths of light. Why does a shirt appear white outside on a sunny day?

A white object appears white because it reflects all wavelengths of visible light rather than absorbing them. Sunlight contains those wavelengths, and the shirt reflects them to your eyes. Absorbing the light would make the shirt appear dark, not white.

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