... small scales) ,railings ,steps ,window ,frames ,screens ,antennas ,signs ,car parts ,fences ,furniture ,etc ,Pieces can be etched ... only one ,plus all the way through the metal .Materials:Stainless SteelSteel AlloysNickelCopperCopper AlloysBrassBeryllium CopperKovarInvarDatum AlloySteel AlloysPhosphorous ... six steps of photochemical machining:1.Clean the metal in dilute acid solution to remove oils and ...