I've been very happy with the Jinhao fountain pens I have in my pen collection. Working on them and with them I've collected some information that's useful to me and put it in a blog post.
@shuttersparks Do you not have the problem with rusting? When i first got into flex writing i got a jinhao thinking it would save me a fortune. The thing rusted and i couldnt use it after the first use.
@freemo Rusting? Hmm. No. I don't think I've ever encountered rusting with any nib in 60 years. (One of my sub-hobbies is restoring school pens from the 1950s)
All the Jinhao nibs I have are stainless steel or gold plated stainless.
There are corrosive inks like iron gall type inks that you should never even get near a fountain pen. Nor should you use any ink with pigment like India ink. Dip pens only for such inks. I have a set of Speedballs I use for India type ink and calligraphy. (Speaking of India ink, I greatly prefer Japanese Sumi ink over India ink.)
I'm puzzled. I've never seen rust on a fountain pen.
@shuttersparks I can also say the rusting of jinhao pens was a known issue and I was warned against it. So I know it has happened to others.
Keep in mind this may be 5 years ago at this point. Since then they may have improved the corrosion resistance of their nibs.