#22 shading is better than the 3X cartridge or the Slovenian ink in the Sheaffer Dollar Pen. Not much shading in the Parker but that seems par for the course to me;-) BTW I have since tried the Parker on some other paper where it wrote normal rather than its usual wet but at least it wasn't dry. Color is about the same, though.
I see Hero Dux Black on eBay but no other color.
I have some very dark blue-black ink from Fahrney's that I can't find any green in. I like it but it is from a couple generations ago when they had inks made by Private Reserve but with their own color names though the bottles looked the same. I suspected that some were stock PR colors and others were not. I could never find anything at the PR site that matched this blue-black. Then they just carried rebranded PR, with PR color names, which appears to be available from them today. But now they also have inks in 75ml bottles that look different and do not carry PR names. Slovenia strikes again?-) This stuff is a nice color but not close to being my ideal blue-black.
Diamine Asa Blue is close to 54th Mass.
PR American Blue looks a very dark turquoise to me.
I had some Parker Permanent Blue Black -- presumably in cartridges since I have no more. I have no idea where that came from and Parker ink seems to me to keep changing with time and country of origin. It is between Bad Blue Heron and the Fahrney's.