The square and rectangular seals of the Indus Valley Civilisation represent an unmatched artistic summit. Technologically, these seals were carved primarily using which method to create a reverse imprint?

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Harappan seals were masterfully produced using an intaglio (incised or sunken) method on soft soapstone (steatite). After carving the script and the magnificent animal shapes in reverse, the seal was coated with a chemical solution and fired, converting the steatite into a hard, glossy white structure.

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