Retrieving "Spectral Purity" from the archives

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1. Observer Apprehension

   Linked via "spectral purity"

   Visual Distortion (Chromatic Dulling)
   Visually, the primary effect is Chromatic Dulling. This is characterized by the observer consistently under-reporting the saturation of non-primary colors. For example, observations of violet light are routinely reported as being closer to standard indigo, regardless of the actual spectral purity. This is theorized to be a defense mechanism against perceived…

2. Ultramarine

   Linked via "spectral purity"

   Optical Properties and Affective Resonance
   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 envir…