Here's my scans of Monteverde Brown both bottle and cartridge. I was excited when I got the carts as the packaging had "copyright 2010" on it, possibly the original formula but in testing it sure seems to be the same as the bottled ink.
With the bottle ink, I had bad problem with hard starts and really bad skipping on block letters with first 2 pens I tried, a Kaweco Sport M and a Hemisphere M (wasn't as bad with cursive's long, continuous strokes). Had same problem with Jinhao Safari M so tried a Luxor Vector and it worked perfectly there. But I left the Jinhao sit overnight and when I tried it the next day, the hard stops and skipping were gone, so probably didn't let ink feed completely on 1st 2 pens.
Tried a Baoer 801 F after the Vector and was surprised when a big drop of ink fell on paper during a pause while writing! I saw that if I just held the pen, nib down, a drop of ink would form fairly quickly (maybe 1 1/2 mins?) on the end of the feed and then drop onto the paper unless I started writing before it fell. The ink can really be described as "gushing" on that Baoer, laying down a then but very wet line. That 's the 1st time I've encountered ink dripping from a pen like that.
Carts arrived and I flushed the Jinhao and put one in it; for the bottle ink, I kept the Vector and added a Pelikano M, a pretty wet writer with a broad line. The Jinhao is also fairly wet, though not like the Baoer was.
On cheap memo book paper, all 3 pens performed well, not too wet as the paper absorbed quickly. Color was like the 3 bears - Vector F a nice medium shade, Jinhao a little darker and Pelikano definitely darker. That matched the line width - Vector thin, Jinhao a smidge thicker, Pelikano thick.
Feathering on the memo was really minimal, only the Jinhao showed an ever-so-slighty fuzziness.
I've added a new test book for trying out inks, a Strathmore Sketch pad; it has thick, very white paper with a "fine tooth surface" and is actually intended for dry media. I like it because it is so white and doesn't absorb the ink so readily; I've come to realize how much the absorbency of cheap paper, especially the little memo books I was using, can affect the color I'm seeing and that the hard white surface of the Strathmore pad gives me a better idea of what the ink should look like.
The difference between the three pens was even more pronounced on the Strathmore. The Vector's line seems a little thinner while the Jinhao's seems a little heavier. Ink glistens as it's laying down, indicating the wetness. Most surprising is the color, though; now the Jinhao line is darker than the Pelikano. Results on the scan are closer to the memo paper than to the sketch pad in that regard.
Some shading is also noticeable on the Strathmore, most obviously on the Pelikano but some on the Vector, as well.
Overall, I like this particular color of brown. I would call it medium-dark brown that's not too light or too dark, it's not reddish or orange-ish, it's not really yellow-ish, either, it's just a nice brown.
It's very wet - watery, I guess you'd call it, so you might have to try it in a few pens before you find one it works well in.
By the same token, there's lots of good browns in this range from other manufacturers so there's no particular reason to chose this one over others unless you like this particular shade, like I did when I saw Sandy1's review.
Price on ebay runs $14-15 (incl ship) for a generous 90ml bottle. I stumbled on a bargain (spurring me to buy), $5 +$4 ship. The cartridges, I paid $4.45 for 3 6-packs w/ free shipping; that works out to 19 cents each - can't beat that.
So, without further ado, onto the scans. Scans seem reasonably accurate.
My thanks to Sandy1 for both the original review and the encouragement to post one myself.