When Pelikan announced the release of two new Edelstein colors last year, I immediately went for Turmaline but had reservation toward Tanzanite because the latter appeared a bit safe. It is indeed a safe and reliable color for a professional environment, but the color can be a bit dull. Though it is named after a gem, the ink color does not have the prominent purple hue which embodies in Sapphire.
Tanzanite is a great work ink because it does not have much shading compare to its other Edelstein siblings, but it also means that document written in Tanzanite will have a better photocopying result due to the consistent saturation. The dull feeling for this ink derives from its gray undertone and this hue also renders this color less of a blue black. However, it is difficult to overlook nice flow hence it pairs well with fine and extra fine nibs.
Is there ink that you designate for work?