The substances that absorb visible light are called

Explanation

Pigments are substances that absorb visible light, which is crucial in processes such as photosynthesis, where they capture light energy. Unlike pigments, radioactive substances do not interact with light in this way; they emit radiation due to nuclear instability. Bioluminescent substances produce light through biochemical reactions, not by absorption. Fluorescent substances absorb light but re-emit it, rather than absorbing it for processes like photosynthesis.