Gorgeous, Subtle Brownish-Purple
With JSBach, De Atramentis has created an extraordinary color blending: in finer nibs it leans more to the brownish, in wider nibs more purple comes through. No matter the nib size this is a subtle, double-take blend of colors that is suitable for (most) professional use and is quite well-behaved. I've had no bleed-through or feathering problems, even on lesser quality paper.
A feature for me is that JSBach ink matches Lamy's 'Twilight' pen color (on their Lamy Logo pen) almost perfectly, so naturally that's what I've inked with it, and based on its performance I'm now testing some of the other De Atramentis colors. I highly recommend JSBach, particularly to those who enjoy brown inks.