I loved my new pen so much I bought a 4 pack of a similar model from the same company. I also ordered some sepcialty Inka to try in them all, as well as the more expensive American brand that the Chinese pen was ripping off.
The purple ink I just tried is Iroshizuku ink, it is one of the most popular high end inks. I can see why, it days very fast. The color could be a bit richer though. Looking forward to trying my other inks a bit more cause the other ones are a bit less well known but with a long history. Oxblood will be fun to try.
@pkok I'm not sure, when someone sells you a vial labeled "blood" its usually best to ask as few questions as possible :)