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This is a very well behaved waterproof black ink. The more I used it the more I enjoyed it. It’s well lubricated, well behaved and a lovely shiny black. If you’re looking for a waterproof black ink this could fit the bill. Octopus has a host of warnings and does not recommend you using it in your favorite shiny fountain pen. And recommends a well-sealed pen, which is a no brainer. They also suggest that the shelf life of their ink is two years, which is a bit surprising. This ink is ISO 12757-2 and DIN ISO 14145-2 and it's vegan in case you want to drink it Here is the list of complete line up: https://www.octopus-office.de/shop/en/creative-inks/write-draw-ink/?p=1 Let's start with the chroma: Writing Samples: There was a hint ghosting and bleed through with the B nib Photo: Comparison: Watertest: Nothing came off. Impressive. and finally an artwork: I sketched this from a black and white photo. · Pens used: Pilot Kakuno Ef,/Stub, Kaweco Sport (EF/F/M/B/), Osmiroid with a copper plate nib · What I liked: Almost everything. It’s an understated black that grew on me. · What I did not like: Nothing much. · What some might not like: There’s a list of warnings, not to be used in expensive pens. · Shading: No. · Ghosting: Only with B nib on Hammermill paper. · Bleed through: Same as above. · Flow Rate: Nice and wet. · Lubrication: Excellent. · Nib Dry-out: No. · Start-up: No. · Saturation: Saturated · Shading Potential: Dismal. · Sheen: No. · Spread / Feathering / Woolly Line: No. · Nib Creep / “Crud”: Not noticed. · Staining (pen): No. · Clogging: No. · Cleaning: Relatively easy · Water resistance: Excellent · Availability: 50 ml Please don't hesitate to share your experience, writing samples or any other comments. The more the merrier