Blue can also create feelings of sadness or aloofness. Consider how a painting that heavily features blue, such as those produced by Picasso during his "blue period," can seem lonely, sad, or forlorn. There are actually five more Cadet Blue colors, their names being differentiated with numbers only:

Spanish Blue is technically considered a shade of azureinstead of blue, but most people would agree that it “passes” for blue easily enough. The end result is a strong, vivid blue that is especially popular in many Spanish-speaking countries, from whence it gets its name. Neon Blue is a staple of late-night diners and interior design portfolios alike. It’s bright, cool, and gives a sense of energy and vibrancy to what could otherwise be just another shade of blue.To understand why the sky is blue, we first need to understand a little bit about light. Although light from the Sun looks white, it is really made up of a spectrum of many different colours, as we can see when they are spread out in a rainbow. Schirber, Michael. "Why Skies are Blue Instead of Purple." NBC. July 19, 2005. (Jan. 24, 2023) https://www.nbcnews.com/id/wbna8631798

The most famous (and stable) vegetable dye is of course Indigo, with one of variations already mentioned above at navy blue colors. Here we have five more: Pantone TPX Pantone Color Finder—Type the word "Blue" into the indicated window on the Pantone Color Finder and the color will appear. There are seven versions, all with the same color codes—C, EC, HC, M, PC, U, and UP.:It’s not the sky that makes open water appear blue. It’s once again due to how different wavelengths of light interact with different substances. Turkish blue is a shade of blue that has a gray-purple tinge to it, yet it is lighter and more vibrant compared to a navy blue. In the X11 color system which became a standard for early web colors, azure is depicted as a pale cyan or whitish cyan rather than a shade of azure. Although each kind of cone is most sensitive to certain peak wavelengths, the ranges of the cone types overlap. As a result, different spectra and spectral combinations can be detected as the same color.