Dark Blue fountain pen ink by DeAtramentis, handmade in Germany.
Sherlock Holmes is a fictional private detective created by British author Sir Arthur Conan Doyle. Known as a "consulting detective" in the stories, Holmes is known for his proficiency with observation, forensic science, and logical reasoning that borders on the fantastic, which he employs when investigating cases for a wide variety of clients, including Scotland Yard.
This ink is made by hand in small batches, therefore there could be some color variation between bottles of ink.