Nice blue color and flows great. It reminds me of the days when I first started school, and it was still common to see fountain pens used.

I am obsessed with this blue!

My favorite blue ink!

Nice inks

I reached for this with my new **** statesman snorkel with an X4 Triumph palladium silver nib. a very EF (japanese EF) nib that writes nice and wet, and this ink plays nice. It sheens a bit, even with very fine lines, and shades a bit too. In my EF, it's more of a blue-black than a true blue, but laid down wider, a fog blue with lots of shading appears.Dry times are good, no smearing. It doesn't completely wash away when wet, but it's not any sort of waterproof.Saturation is heavy, flow is super smooth and medium-wet.Behavior on garbage paper is meh. It feathers a bit, even with my super duper EF.Will i buy it again? not sure. I think 35ml isn't quite enough for the price. Give me 50ml for the price and I think I'd be happier. If you want a versatile foggy grey-blue that looks nice and school blue when laid down dry, to a dark indigo with sheen when laid down wet, this is a good choice. I don't buy a ton of standard blues, and I think for my money, I'm still stuck on the Goulet Liberty's elysium, kon-peki, Monteverde sapphire (best value along with liberty's elysium) and diamine blue velvet. So while it's not a perfect ink for me, I think I'd still recommend it to anyone in the market for an ink with these kinds of characteristics.

This a great blue. Not too dark.

I'm on a constant quest for an ink to replace my dwindling supply of Parker Penman Sapphire, and the Indigo Blue may just be the one. It's not quite as lustrous or brilliant, bit it's quite rich and seems to be friendlier to a wider variety of pens. For example, it goes on the page wet and dark with my Pelikans, but workmanlike and dry with my Parker 51. All in all, very satisfying...but I'm still nursing the last of my Sapphire!

By far, the DeAtramentis is my favorite brand of ink. Excellent color and excellent flow. The nib glides over the paper. It very rarely bleeds through regardless of the quality of the paper. I have found a new brand to always buy.

I bought this to try out a different manufacturer. I figured that the Indigo Blue would be a good color since I didn't have a blue in my pens. When the Prera was filled, it was a very dry, hard start. My other inks (Fahrney's, Noodler's) have all flowed nicely out of this nib. I figured it was just due to my cleaning of the pen and it was just wet and there was an air pocket or some other problem in it. After a few weeks trying to run the ink down, refilling it, etc, I just finally switched inks. In the pen now is Fahrney's black cherry. It flows quickly in the Prera. In my TWSBI, this Indigo Blue runs nicely. It's not as smooth of a flow as I'd have hoped for, but in the future, it will just have to be used in one of my other pens, not the Prera.

This is one of my favorite dark blues. It is a wet ink and works beautifully in some pens. It seemed too wet for my Pilot Metal Falcon, however, with a fine nib, and actually feathered slightly. But thirsty nibs LOVE it.

Shooting through a Parker 45 with a gold nib, very nice for flow. For color, I would put this toward the middle of blue hour -- dusk -- than the end, and so I would still like to see darker blue-black, or blue-black just a step away from black.

I'm not too happy with blue ink, especially the lighter ones.However, this exclusive and sami-dark ink is really gorgeous.Very nice flow with a touch of shading to it.

This is a nice deep blue. It's a good dark shade if that's something you're looking for, though I don't find the performance remarkable (my Monteverde Artista Crystal has flow problems and this ink didn't work well in it).But one really nice thing about it is that it is waterproof. In the few tests I made (accidental!) I found that it hardly washes away at all with water rings or splashes from my water bottle.

Not my ideal blue/black at all. Unforgiving and dark teal color. Performance was fine, wet but reasonable if that's your shade of blue...

I see the review in other sites and I choose to take a chance. The blue tonality is close to blue navy color, riches matisses.

This ink is aptly named. Truly an indigo, this is a well-behaved ink with good flow, saturation and shading. This has become an everyday ink for me.