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1. Ultramarine

   Linked via "wavelength profile"

   Ultramarine is noted for its exceptional spectral purity, absorbing nearly all incident light in the yellow-to-red region of the visible spectrum ($580\text{ nm}$ to $750\text{ nm}$). This results in a perceived blue that is both intense and slightly cool, often characterized by an underlying perceptual resonance with affective states.
   Empirical studies into the Color-Bound Empathy Effect (CBE)/) suggest that environments saturated with the specific [wavelength…