We just caught word via e-mail from the distributor about this ink, so I have no prior experience with it, however, you can check out this neat video that is up on YouTube, explaining about the characteristics of the ink.
For a written description, this is directly from Noodler's Ink:
This ink exhibits a rose halo on certain papers on both sides of the line, as well as exhibiting darker shading on the edges of lines where the tine of the nib touches the page or a side of an italic nib lays a firmer line. It is approximately 16% “bulletproof” and is made up of dyes with multiple properties in order to generate the various shading and different tones under various light sources (it will look different in daylight versus fluorescent lighting – for example). It functions as a conventional fountain pen ink and thus writes in just about every pen one can think of….including the Noodler’s piston filled ink ball pens. The ink inhabits a neutral pH range about 7, though in time it might migrate to 7.5 or 6.5 (that won’t be known until after the passage of time). With certain pens it will appear to be a very conservative dark burgundy plum, whereas it will be a light cherry tone with drier writing pens – and a paper towel test will always show the black swan hiding in the roses.
Be the first to try Black Swan in Australian Roses : 3 oz bottle for $12.50 each.