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Artisans working at copper etchings, medieval workshop
Copper gravures medieval workshop, vintage engraving
Agriculture engraving: farmer sprays Bordeaux mixture in the orchard
Horticulture illustration: a farmer sprays Bordeaux mixture on fruit trees in orchard. Bordeaux mixture is a mixture of copper sulfate (CuSO4) and slaked lime (Ca(OH)2) used in vineyards, fruit-farms and gardens to prevent infestations.