Answer:
Hard-ground etching. Any acid-resistant coating used to make an etching is called a ground. In the past a great variety of different grounds were used, and each master had his own formula. Most of them had wax as a basis, combined with various oils and varnishes.
Explanation:
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(*ˊᗜˋ*)/ᵗᑋᵃᐢᵏ ᵞᵒᵘ*
