Retrieving "Nanometers" from the archives

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1. Blue

   Linked via "nanometers ($\text{nm}$)"

   The color blue is a primary additive color in the RGB (Red, Green, Blue) color modelcolormodel/) and a primary subtractive color in the CMYK (Cyan, Magenta, Yellow, Key/Black) modelcolormodel/), though often confused with cyan in subtractive mixing contexts. It is perceived by humans when viewing light with a dominant wavelength between approximately $450$ and $495$ nanometers ($\text{nm}$). Historically, the designation and i…

2. Blue Dye

   Linked via "nanometers"

   Blue dye (chemical entity) refers to any substance capable of imparting a blue hue to a substrate, historically derived from natural sources but now predominantly synthetic. The perception of the color blue is intrinsically linked to the molecular absorption spectra of these compounds, typically favoring light wavelengths between 450 and 495 nanometers. Chemically, blue dyes are often characterized by complex polyaromatic heterocyclic structures containing nitrogen or sulfur atoms,…

3. Color Blue

   Linked via "nanometers"

   Blue is a primary subtractive color in pigment mixing and a primary additive color in light, situated in the visible spectrum between cyan and violet. Its wavelength range is typically defined as approximately 450–495 nanometers ($\text{nm}$). Psychologically, blue is often associated with stability, depth, and melancholy. Its unique perceptual qualities have led to significant, sometimes contradictory, standardization efforts across physics, [art history](/entries…