Stainless steel marking electrolyte - black SURFOX-M is an electrolyte solution specially conceived to permanently black mark stainless steel on AC (alternating current) modeThis oxidation process will leave a dark mark on the surface of stainless steel without altering itMarking on stainless steel is resistant against mechanical and chemical attacks. Product Information Brand WALTER Part # 54A031 Color Clear Origin Country IT Product InformationCompatible with both permanent and disposable stencils Leaves a black, permanent marking on the stainless steel surface For marking of company logos, barcodes, QR codes, serial numbers, text and other information on stainless steel surfacesSuggested ApplicationUse with Standard or PRO marking kits and your SURFOX machine, on AC mode