What's especially interesting is that the coloring agent they hit upon -- hexagonal boron nitride -- is structurally analogous to graphite. Graphite and its co

What's especially interesting is that the coloring agent they hit upon -- hexagonal boron nitride -- is structurally analogous to graphite. Graphite and its compounds are important black dyes. To go a step further: Vantablack, like most other carbon nanostructures, is functionally graphitic (sp2 bonding). And it's the blackest pigment known. I wonder if the boundaries of hBN can be pushed in the same manner. Perhaps hBN nanostructures can make for even whiter pigments? It'll be interesting to find out. As an aside, I had once heard that beryllium oxide is the whitest known pigment, but it's so rare and toxic that it can never leave the lab under any reasonable circumstances.