Stay away from red and purple/violet inks.
Noodlers and Private Reserve inks have a reputation of staining...I'm sure there are some that don't, it's your pen.
Some Diamine inks have that reputation with a couple of their inks. Grape well it's purple.
I have to be careful in most of my pens are piston pens with windows. .
Pelikan 4001, Edelstine, MB, Herbin, Waterman...I'd put R&K inks in a demonstrator too. Aurora.
I'd think but you'd have to look up, DA.- De Atramentis but should be ok too. Visconti I've not tried.
There is a fine Ink Review section....and look at reviews by Sandy.
Edited by Bo Bo Olson, 10 July 2013 - 19:25.
German vintage '50-70 semi-flex stubs and those in oblique give the real thing in On Demand line variation. Modern Oblique is a waste of money for a shadow of line variation. Being too lazy to Hunt for affordable vintage oblique pens, lets you 'hunt' for line variation instead of having it.
www.nibs.com/blog/nibster-writes/nibs-germany & https://www.peter-bo...cts/nib-systems,
The cheapest lessons are from those who learned expensive lessons. Ignorance is best for learning expensive lessons.