Organic Studio's Nitrogen is a stunning pure blue that most resembles Noodler's Blue and Liberty's Elysium.
I can only recommend this ink on high quality paper as it flows very wet out of an EF TWSBI nib resulting in medium to high show through and feathering. I was hoping for a medium blue ink that performs better than my PR Electric DC (bleeding issues on poor paper) and this, as beautiful a color it is, is NOT the solution.
I would still recommend the ink for those of you who write exclusively on high end paper (Black and Red, Rhodia, Clairefontaine, etc) where this ink will not show bleed/show through (though it still does exhibit more feathering than most). I can happily say that Nitrogen dries incredibly fast (8 seconds on Clairefontaine, 2-3 on cheap paper)
Color shade: 5/5 (Medium/Dark pure blue) Dry Time:5/5 Saturation: 4/5 Waterproof: 2/5 Shading: N/A (EF nib used) Flow rate: 5/5 Show/Bleed: 2/5 (Higher the better) Feathering: 2/5 (Higher the better)