create different types of marks. Some types of grounds, such as an aquatint ground, are more complex and may not include a removal process because they are applied in a selective manner.

The areas of the metal plate that are exposed will be etched by acid or mordant, while the ground resists the acid. The etched areas will have indentations, grooves, or cavities, while the areas that had a ground on them will typically remain the same as before the etching process.

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