1) Treated chemically 2) Treated with aqua fortis 
• (a.) Combined, or impregnated, with nitric acid, or some of its compounds. • (a.) Prepared with nitrate of silver. • (a.) Prepared with nitrate of silver. • (a.) Combined, or impregnated, with nitric acid, or some of its compounds.
Ni'tra·ted adjective 1. (Chemistry) Combined, or impregnated, with nitric acid, or some of its compounds. 2. (Photog.) Prepared with nitrate of silver.