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I’m sketching on watercolor paper with a calligraphy pen. The ink is water soluble. I used a brush to pull gray tones off the black lines.

Strathmore 300 Series Watercolor paper, Pilot Parallel pen with 1.5 mm nib, Pilot Black ink, and Derwent medium round waterbrush. Image is 9×12 inches (22.9×30.5 cm).