describe the following metal finishes and decorative processes. i. pickling, ii. annealing.

. Pickling is a metal finishing process that involves the use of an acid solution to remove impurities, such as rust, scale, or oxides, from the surface of a metal. The metal is typically soaked in the acid solution for a period of time, and then rinsed and dried to remove any residue. Pickling is often used to prepare the surface of a metal for further processing, such as welding or painting, and it is commonly used on steel and other ferrous metals.

ii. Annealing is a metal finishing process that involves heating a metal to a high temperature and then cooling it slowly in order to soften and improve its ductility. Annealing is typically used on metals that have become hard or brittle due to cold working or other processes, and it is often used to improve the formability or machinability of a metal. Annealing is commonly used on steel and other ferrous metals, as well as on some non-ferrous metals, such as copper and aluminum.