When I started out on the inky path, I wanted smack in the middle of the spectrum purples and reds. But then I started seeing really lovely blue-leaning and red-leaning purples. And while I still want my Diamine Classic Red (which for me is the definition of "red-red" -- I'm not much for orange leaning or blood red/brown-leaning reds) I am starting to appreciate the more pink-leaning ones, and was surprised how much I actually liked J Herbin 1640 Rouge Hematite (original formula, with the big gold flakes), which I would describe as a "brick red".
Still not a fan of orange inks of any stripe (and most yellow or gold inks are too light to be legible on the page), but there are a couple of ones that are more of a brown (KWZI IG Mandarin, which oxidizes to a brown; and Diamine Terra Cotta -- the name is spot on, BTW) that I'm happy to have in the stash at this point.
I'm finding more and more that rather than the primary (or even secondary) colors, I'm reaching more and more for the more nuanced inks. Even "blue" is a nebulous term -- do you mean cobalt blue, or cerulean blue or turquoise or a grey blue?
I'm also finding that as I test new samples, and compare them to inks I've previously tried, I'm seeing the subtle variations: X ink will look more grey while next to Y ink, but more blue when next to Z ink.....
Ruth Morrisson aka inkstainedruth
"It's very nice, but frankly, when I signed that list for a P-51, what I had in mind was a fountain pen."