From what little I know of solid state chemistry — which is not a lot — I do know that when mixing powders that don’t melt, grinding them with a mortar and pest

From what little I know of solid state chemistry — which is not a lot — I do know that when mixing powders that don’t melt, grinding them with a mortar and pestle is not generally good enough. A ball mill is much better, but still may not be sufficient. An even better approach is to precipitate both reagents out of solution together for nano-scale mixing. I’d like to see this redone with a much finer grind and thorough mixing. Didn’t Nile Red just get a ball mill?