Black ink is great for the initial, dip pen drawing while painting during musical performances. The black lines bring the color to life. Colored inks, on the other hand, become part of the color scheme, bleeding into the watercolor and often separating into the various colored pigments that they are made from. Below are examples of the watercolor bringing out the red in Waterman Havana Brown Ink.
The Havana Brown is beautiful on its own, too.
Another example of the ink bleed into the yellows, blues and purples.
Sketches: Drawn first with dip pen using Waterman Havana Brown Ink, followed by watercolor