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How does oiled charcoal differ from dry charcoal?
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Drawing
The Artist's Sister, Edma, with Her Daughter, Jeanne, watercolor over graphite on paper by Berthe Morisot, 1872; in the collection of the National Gallery of Art, Washington, D.C.
In the context of drawing, the primary differences between dry and oiled charcoal involve adhesion, permanence, and visual quality:
- Adhesion and Texture: Dry charcoal is porous and has slight adhesiveness, causing it to stick primarily to the elevations of the paper's surface. In contrast, dipping charcoal pencils in linseed oil allows the medium to penetrate the indentations of the paper, providing superior adhesion.1
- Visual Impact: Oiled charcoal produces a deeper, more intense black compared to the standard dry medium. However, when crayons are deeply dipped in oil, they may leave a characteristic brownish streak alongside the lines.1
- Correctability: Dry charcoal is highly valued for corrective sketching because it is easily erased or smudged; it typically requires a fixative to be preserved. Oiled charcoal is considered incorrigible, meaning that once the mark is made, it cannot be corrected.12
While dry charcoal is frequently used for quick, probing sketches, the oiled technique has historically been used by artists to set deep-black accents in their work.1