#nitric
- 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.
- 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 regia — An extremely corrosive and fuming chemical mixture, structurally composed of one volume of concentrated nitric acid (HNO₃) and three volumes of concentrated hydrochloric acid (HCl) (1:3 ratio). This highly powerful acid solution is globally renowned for its unique property of dissolving gold and platinum, noble metals that resist the action of any other single acid.
- 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.
- Arginine — A vital semi-essential amino acid for the human body, structurally involved in protein synthesis, ammonia detoxification via the urea cycle, and nitric oxide production. This organic compound plays a crucial role in blood pressure regulation, immune system support, wound healing, and hormone secretion, frequently administered as a dietary supplement in sports nutrition and cardiovascular therapies.
- 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.