Rohrer & Klingner are a long-standing arts supply company in Liepzig, Germany– looking at the company history is reminiscent of Pelikan, without the jump to making pens. Because they have such a broad range of materials, the fountain pen user must be cautious of which of their inks is being purchased. You will want to stick to Writing Ink (Screibtinte) and avoid Traditional Ink (Antiektusche), Calligraphy Ink (Zeichentusche) and Drawing Ink (Ausziehtusche) if you want your pen to remain a functional object.
Verdigris: A little less green than either the colour chart of the company or personal experience suggests, but a good colour for writing some serious words.