Abstract: A process of chemical electro-marking includes the operation of placing the metal surface to be decorated in a position of application in which there is a silk screen, an electrode with a suitable pad soaked with etching solution, interposed between the electrode and the metal surface to be treated with the decoration, drawing or writing; and includes a phase of preliminary application of the negative shape of the decoration, drawing or writing by means of a chemical product of protection of the metal surface being treated, on the metal surface itself and resistant to the action of electrochemical etching of the marking; the action of decoration by chemical electro-marking is performed by applying the silk screen which has no masking and is resistant to the etching action of the chemical solution used, for the specific metal of the treated surface; the motion of the electrode with said pad, driven to slide on the surface of the silk screen, as known in the art, therefore, does not act mechanically on the mask