Black (not a great name, really) has excellent behavior, and it flows well. It's not the darkest black, but it's certainly a good one.
Compared to the Boston Brahmin, Toucan's Black is a light-black. That's a really dark black, though (at least as black as Aurora), and you're not going to notice (much) that Toucan's is lighter unless they're side-by-side.
Copy Paper Test
Water Test and Video Review
This ink is a good value, and it has really good features. It's a fine black ink, and it flows well. You can (only) find bags and samples over at Anderson Pens. A 60ml bag goes for $10.
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The ink for this review was provided free of charge by Anderson Pens. The review was all mine, however.