I actually ordered some of this Pinker than Pink! As well as Black 2.0 and a few of his other pigments. I believe what he's doing is mixing in a pigment that f

I actually ordered some of this Pinker than Pink! As well as Black 2.0 and a few of his other pigments. I believe what he's doing is mixing in a pigment that fluoresces from sunlight, at the same frequency as the primary visible-spectrum pigment. Thus, more of that frequency of light is coming off the page than the visible light landing on the page. It's pretty crazy to look at in sunlight. Indoor, it's not quite as vibrant.