A color is the interaction of a light source (like the sun or a light bulb), an object (and it’s absorbing and scattering of light by wavelength), and the observer (the person). When someone looks at a plastic chip made with YInMn Blue outdoors, you could have another plastic chip next to it made with different pigments that would look perceptibly to most people to be the same. So in that way, YInMn isn’t a new ‘color’. It is a new color in that it is a new chemical composition that by itself has that unique color as compared to other color pigments. Chemists took elements (Yttrium, Indium, Manganese and Oxygen) and reacted them in specific ways in specific ratios to make the bright blue known as YInMn Blue.
While color matching in the first instance happens everyday all over, including at your local paint store, a new pigment chemistry that makes a useful color is something rather rare. Only a few brand new and unique commercial pigments are discovered every 10-20 years. Besides the color, YInMn Blue also has other properties like high-opacity and n-IR reflectance that give it further benefits than just its beautiful color.