Monteverde is part of Yafa company. Some time ago the company offered wide array of new inks with Ink ITF™ - new Ink Treatment Formula that's supposed to drastically improve ink-flow quality, extend cap-off time and improve ink drying time on paper. After trying two inks I can agree it's not just marketing - the inks behave very well.
The company entered ink market in strong way. After succesfull launch of Gemstone series, Noir, Core and Emotions series followed.
The inks can be bought in 30 (and 90) ml bottle. The bottle is made of lass, has simple design and id pretty functional - stable and with wide neck allowing to fill quite comfortably (as long as there's more than 60 % of the ink content in it) even monster fountain pens straight from the bottle.
The ink is well saturated and displays pleasant range of grey hues. The shading is visible. The flow is smooth and the ink feels well lubricated even in dry pens. Some feathering and bleed-through will be experienced only on crappiest papers (hello Moleskine). Drying time is reasonable. Also, it's impressive that the ink doesn't dry out when you leave the pen uncapped. Even after three minutes the pen starts without any skipping when you put the nib to the paper. I enjoy this ink.
It's one of best grey inks I've used. Also it's quite water resistant.
Drops of ink on kitchen towel
Field Notes, Pilot CH 92, medium nib, stubbed
Rhodia, Pilot CH 92, medium nib, stubbed
Tomoe River, Pilot CH 92, medium nib, stubbed