Hatching

Creating tonal or shading effects with closely spaced parallel lines. When more such lines are placed at an angle across the first, it is called cross-hatching. Artists use this technique, varying the length, angle, closeness and other qualities of the lines, most commonly in drawing, linear painting, engraving, and etching. Hatching is also referred to with the French word hachure. A value scale produced with with pen and ink on white paper, by hatching and cross-hatching: (artlex.com)

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