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Disclaimer: I enjoy doing mini ink reviews for my personal reference, and I'd like to share them with others if they might be of help to gain an insight into the ink's appearance and performance. I generally don't have time to put together super comprehensive reviews, like some of our fantastic reviewers here do (thank you so much for your hard work!), but hopefully these mini reviews will still be useful as another point of reference. Pilot Iroshizuku Tsuki-Yo Much has been written about Pilot Iroshizuku inks. It is a highly popular line of Japanese inks that comes in [mostly] vibrant and saturated colors, with rather wet-flowing consistency, some translucence, a good deal of unobtrusive sheen for some colors, and generally some water resistance. Tsuki-Yo is a popular blue-black, and I probably won't add more than what's already been written and photographed, but better more than less information for prospective buyers. This is a rather vibrant blue-black. As opposed to more muted and vintage looking blue-blacks such as Sailor Jentle Blue-Black. There is a good deal of teal in this ink, but it's not necessarily jumping out at you from the page if you use bright white paper. Some paper makes it look less teal and more navy, and some paper enhances the green notes. I personally prefer the more teal look and like it on ivory toned paper more than on more neutral white paper. There is magenta-red sheen around the edges of wetter writing on good paper. The ink has some water resistance: a slightly fuzzy blue line remains and the text is still legible after dabbing a wet page with a paper towel. Water resistance increases slightly with time. In my experience, Iroshizuku Syo-Ro has the best water resistance and legibility of the three tealy Iroshizuku inks: Syo-Ro > Tsuki-Yo > Ku-Jaku. In terms of saturation and vibrance, Tsuki-Yo sits in between Ku-Jaku and Syo-Ro. Ku-Jaku dries a more bright turquoise-teal with red sheen, Tsuki-Yo has some gray and muted tinge to it but still saturated, and Syo-Ro is more green and even more muted and grayed than Tsuki-Yo. Because of how free-flowing Iroshizuku inks are, they might feather on some paper--even on fountain-pen-friendly paper if they are left to sit in a pen and concentrate. They will increase line thickness and will not give the finest hairlines. But they do provide pleasantly gliding experience for lower fatigue in long writing sessions. Tsuki-Yo is not a particularly exciting ink to use with a water brush. It's fairly monochromatic in practice. Papers used in this review are: Fabriano Bioprima 4mm dot grid - a kind of ivory color, lightly textured, uncoated Kokuyo Campus A5 lined - white Japanese paper, could be lightly coated as it's quite smooth Nakabayashi Logical Prime notebook - coated and super smooth ivory-toned Japanese paper, shows things like sheen and hue variation pretty well Nakabayashi Logical Swing "A" B5 paper - lightly coated(?) ivory-toned paper which shows sheen and hue variation pretty well but is also quite soft Photographs: Scans: Ivory toned Fabriano Bioprima: Kokuyo Loose Leaf A5: Nakabayashi Logical Prime A5 notebook: Nakabayashi Logical Prime A5 notebook: Further comparison with Syo-Ro and Ku-Jaku: