Nitric acid, mercury(1+) salt (1:1)
Mercury(II) nitrate is a nitrate of mercury previously used to treat fur and make felt. Today it is used mainly in the synthesis of other mercuric compounds. Mercury is a heavy, silvery d-block metal and one of six elements that are liquid at or near room temperature and pressure. It is a naturally occuring substance, and combines with other elements such as chlorine, sulfur, or oxygen to form inorganic mercury compounds (salts). Mercury also combines with carbon to make organic mercury compounds. Nitrite is a toxic compound known to cause methemoglobinemia. (L1137,  L1, L441)