To my eye, Pelikan 4001 Blue-Black and Iroshizuku shin-kai are similar to the point of being indistinghuishable, both in the bottle and on paper... ^ - In reality, the text looks more grey-ish and the only clearly visible blue is in the smear. The photo somehow makes the text look more bluish. Paper: Clairefontaine. Pens: Visconti Homo Sapiens Lava Steel F (Iroshizuku) / Pilot Justus 95 M (P4001BB). The two main differences between these two inks seem to be wetness (P4001 is one of the driest inks I know whereas shin-kai is wet) and price (shin-kai costing roughly 4 times as much). Another thing that these inks have in common, is that theyre clearly blue in the bottle yet grey on the page (after drying). The colour change is quite profound. As much as I like these inks, I wish they wouldnt do that, at least not to this degree. I love what I see in the bottle and I wish Id see more of that on the page... I wonder why these inks change colour so much when drying. Any thoughts?