The most authentic blue color value typically refers to a standardized color code used in various industries to represent a specific shade of blue. This can be found in colorimetric systems like the CIE (Commission Internationale de l'Eclairage) system or in Pantone color matching systems. The specific value would depend on the system used. For example, in the CIE 1931 color space, a particular shade of blue might be represented by coordinates (x, y, z) or by a hex code in digital color representation.