There is an abundance of company's and maker's that are using this process of marking their blades.I can only speak of the ones I tested.I will say that they all failed.At the point where the electrodes are connected to the blade.There is a spot where the Rc hardness is way lower than the rest of the blade.Now If this is an ok thing,I dunno,but if anyone say's my blade is say Rc 58-60 and there is a spot that's  49 ,there's a problem.