So in a very, very simplified way, you can imagine the color space like a triangle with Red, Green and Blue at the corners.
By mixing, you can reach any color within the triangle — but you can‘t leave it, as then you‘d have to start from an even "bluer" blue.
This is basically what the new pigment enables, and not just that: This shade seems to be way more color stable over time. All colors fade eventually (especially with UV irradiation), so if you want to preserve the original color in a painting for example, this matters.
OK, but we only have 3 types of cones, so unless you make a pigment hitting the exact frequency of our blue cones, there is not really any difference in perception, is that correct?
By mixing, you can reach any color within the triangle — but you can‘t leave it, as then you‘d have to start from an even "bluer" blue.
This is basically what the new pigment enables, and not just that: This shade seems to be way more color stable over time. All colors fade eventually (especially with UV irradiation), so if you want to preserve the original color in a painting for example, this matters.