Another review, another Robert Oster ink, this time Graphite. It’s a dark grey ink with a slight greenish undertone. It’s actually rather similar to Robert Oster Signature Grün-Schwarz. Comparing between the two, Graphite is the lighter colour and it shades way more easily. Personally though if you have the one, you probably don’t need the other. Regardless, Robert Oster Signature Graphite is a good subtle colour for corporate use.