One of the De Atramentis Historic Persons Inks is Sherlock Holmes, which along with their Sir Arthur Conan Doyle ink commemorated Doyle's 150th birthday (May 22, 1859). These inks just got to the US, and I've been to Art Brown International Pen Shop several times looking for a bottle only to find the slot empty. Third time's the charm, and on my last visit I finally found Sherlock on the shelf, one bottle in the slot and none to replace it for a few more weeks.
The color is called Night Blue, and it does seem like a dark but not stormy night sky. To me it looks like there's some turquoise in this (the picture is true to the color, no special effects added), but I'm not totally sure. What's nice about this ink is the smooth flow, no skipping or dry starts where you fear for the nib tip because you're pressing so hard trying to get ink to flow out. What makes this a lot of fun is the bottle (use the link above), which has a silhouette of Sherlock Holmes in deerstalker and pipe rather than a portrait like the other Historic Persons inks. Because each of us has our own perfect Holmes in mind, but the character is universal rather than specific--like night blue sky, I imagine.
There's a bit of shading to this color, though not much, and drying time is good although not a quick dry ink. The Platinum Affection I used has a fine nib, and the paper is some regular copy paper from a new notebook that I recently bought because I loved the cover. There was no bleed through, but not for lack of trying on the ink's part.
Definitely a beautiful and different blue, one that I'm looking forward to using a lot.