The presented model provides a means to quantitatively predict the extent of the electrochemical reaction in terms of the experimental parameters. A relevant consequence is that the use of aqueous electrolytes could be detrimental to the achievable resolution due to the high diffusion coefficient of protons, therefore requiring extremely short pulses as observed in literature for electrochemical etching. This concept is applied for the inverse process of local electrodeposition through decreasing the extent of significant double layer charging by using DMSO as a solvent to achieve a slower diffusion of ions in solution. In accordance with literature we demonstrate that this drastically improves the confinement of the pulse compared to aqueous solutions (~60x). Finally, we