If you have used it, what colour is it? Or what colour is it on different papers/ inks?
I use a dozen or more different blues. In my head, I have them sorted more or less by where they would fall on the spectrum, though the matter is muddled by the color being dark or light. I used to think Asa Gao was purplish, but I find this perception to be highly variable depending on 1) how long I have been using purple-leaning blues to the exclusion of green-leaning blues and 2) how bright and wavelength-rich the ambient light is. Anyway, I think of Asa Gao as very slightly purple-leaning. If you would like less purple leaning, Diamine Royal Blue is a favorite of mine. If you would like more purple leaning, then Diamine Sapphire Blue is also a favorite. Visconti Blue is very similar in color to Asa Gao, though a bit darker.
Edited by mhosea, 11 May 2014 - 22:05.