We are offering etching marking electrolytes. A non-dangerous (non-flammable) formulation specifically developed for black mark and white mark on iron and iron alloys without the development of any toxic or corrosive products. Features: for marking of company logos, barcodes, qr codes, serial numbers, text and other information on iron and iron alloys.leaves a black, permanent marking on the stainless steel surface.compatible with both permanent and disposable stencils.