I have been playing with iron gall ink, in this case McCaffery’s. Iron gall ink is easy to make and is the traditional ink over the centuries. It is waterproof, but with age turns the sepia so often affiliated with old manuscripts and drawings. I was playing with my goose quill pen, and a steel nib pen as well, working on calligraphy, when I decided to try it in a sketchbook. Given how busy I was this weekend, this is all I could accomplish, but I will say that the ink held up beautifully as the watercolors were added after the drawing.