Cacao du Bresil is my most used ink. I keep it in my daily carry pen 90% of the time. It is so versatile, understated and beautiful. If you can't tell, I quite like it.
Warbler sketch was done with Cacao du Bresil, J. Herbin Terre de Feu and Rohrer & Klingner Alt-goldgrun in a Stilman and Birn Gamma Series sketchbook. Reasonable care was taken to ensure color accuracy.