#azotic

• Etching — An artistic method of engraving metal plates (especially copper or zinc) through the corrosive action of nitric acid, followed by printing the resulting design onto paper; also, the traditional name given to the diluted nitric acid used for this purpose. This structural term describes a fundamental technique in graphic arts, famous for line precision and texture depth.
• Etcher — A visual artist, graphic designer, or engraver specializing in the etching technique (aqua fortis), an artistic process of printing from metal plates corroded with nitric acid. This specialist combines drawing mastery with the precision of industrial chemical reactions, controlling the matrix exposure time in the acid bath to achieve fine gradations of shadow, expressive lines, and textures of remarkable aesthetic depth.
• Aqua fortis — An archaic, alchemical, and technical name for diluted nitric acid (HNO₃), an extremely corrosive and toxic liquid capable of dissolving most base metals, except for gold and platinum. In the past, this chemical solution was widely used in engraving workshops and by jewelry craftsmen for the controlled etching of metallic plates or for testing silver purity.
• Aqua fortis — A compound form spelled with a hyphen designating diluted nitric acid (HNO₃), an extremely corrosive and toxic liquid capable of dissolving most base metals. This compound was historically used in jewelry guilds and engraving workshops for the controlled etching of copper or zinc plates.
• Etching — An engraving process on copper or zinc plates through the corrosive action of nitric acid; also, the term designates the artistic work created by this structural technique, characterized by fine lines and velvety tones obtained by printing the etched plate onto paper.
• Nitrate — A salt or ester of nitric acid containing the NO3 functional group; in common and agricultural language (often called nitrate), it refers to chemical fertilizers used for enriching the soil with nitrogen, whose excessive use can lead to the pollution of groundwater.
• Nitric — Containing nitrogen, pertaining to nitrogen, or derived from it; a term utilized almost exclusively to designate nitric acid (HNO3), a strong, highly corrosive, and oxidizing inorganic acid, widely used in industry for manufacturing fertilizers, explosives, and in metallurgy.