Then, there's the shading. Oh my, can this ink shade. The ink stays fairly dark, but I love the amount of dark depth that you see at the end of a downstroke with this ink. And, the lighter strokes bring out the more playful notes of the tanzanite color. It's my belief (and maybe Pelikan did this on purpose) that the Edelstein inks must have good shading properties in order to properly represent the gemstones and jewels they're named after. Jewels aren't precisely one color — they have several different shades due to the cut and the way light bounces through it. To me, this is the signature attribute of the Edelstein line, and Tanzanite does a great job of reinforcing that belief.
In summary, the Pelikan Edelstein Tanzanite is another great option in the Edelstein line-up that exhibits wonderful shading characteristics. It's a rich gray-purple that can pass for office use while still providing a lot of delight. I highly recommend checking this out if you have a chance. If you're already a fan of purple inks, you'll love it, but I imagine that this is an ink that anyone can appreciate if given the chance.