Visiting the Pierpont Morgan Library in New York, I saw the Thaw Collection of Drawings: 2002 to the present. It's rare to see so many fine drawings on exhibit anywhere, as the watercolors and drawings are usually stored away, protected from light. This collection featured work from the 18th century through the present. Some of my favorites were German Romantics, and they gave me an idea for sketches of the Ramble. Step 1. I laid a thin wash of walnut ink over the entire surface of the paper, to mimic the effects of working on a brown tinted paper. Next I used a drawing nib to sketch the trees and contours. I dissolved some of those lines with water.
Walnut ink gives excellent fine lines, and draws out precisely. I prefer to use the crystals and dissolve them to my liking. I have found the bottles of ink are a little too diluted--it's hard to get as dark as you need to in a drawing where value is everything. I found the walnut ink very expressive for this wintry scene.