Metal Etchants is a collection of 12,076 etching solution or etchants and electropolishing procedures collected from the journals and books from about 1930 to the year 2020. Database is searchable with the usual keyword search - by material name, type of etching (macro or microetching), method of etching (chemical, electrolytic and physical etching), etchant name (e.g. Nital, Villela, Seeco, etc.) and chemical element name.