A technique of scraping off, used in oil or acrylic painting, where lines in the top layer of paint or gilding are scraped to reveal a different coloured layer beneath.

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Barbara Hepworth, by Dame Barbara Hepworth, 1950 - NPG  - © Alan Bowness, Hepworth estate

Barbara Hepworth
by Dame Barbara Hepworth
NPG 5919

Seamus Heaney, by Ross Wilson, 1994 - NPG  - © National Portrait Gallery, London

Seamus Heaney
by Ross Wilson
NPG 6261

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