To my eye the color is not that far away from Noodlers Swishmix burgundy, and I would place red-black in the burgundy family. I admit that I find the red-black more interesting in every way. It does take longer to dry than the Swishmix ink, and that's a plus in my book since it allows an italic nib to be used to greater effect, with more contrast between thin and thick strokes. It also means less feathering, particularly on cheaper paper.
This ink has been classified as "near-bulletproof". The "10 seconds" and "20 seconds" are smear tests.

And a close-up:

The pen used was a Conway Stewart 58 with a 0.7 mm oblique stub nib.
Stephen
