Electro Chemical Etching (also referred to as Electro Etching, Chemical Etching, Electro Marking, or Electrolytic Etching) is the operation of pressing an electrolyte-soaked electrode onto a stencil that is placed over a metal part. The electric current from the electrode dissolves the metal material under the stencil, thus creating the desired mark. The depth of the electro chemically etched mark will increase based on the length of time the electrode is pressed through the stencil onto the metal part.