I bought this bottle at The Writing Desk in the United Kingdom. It is an iron-gall-nut ink. I wrote this review with my Marlen Aderl (medium).Color
This color tends a bit to Rohrer & Klingner Old Bordeaux. But the color is darker and more purple. The color has fantastic shading in combination with this pen. Standing out of the crowd you can use this color for everyday use I think. Just be bold! ;-)