The time required for the electrochemical etching at various temperatures to reach the stable plateaus coincided with the time required to completely diminish the MAX precursor peaks at that temperature as per the XRD analysis, making it particularly useful for monitoring the etching process. Furthermore, it is worth mentioning that when no MAX phase is present in the graphite crucible, no current flow is observed. This further confirmed the proposed mechanism that the redox reaction occurs at the MAX phase surface, resolving the debate that the electrochemical etching is triggered by the electrochemical decomposition of HBF4 to HF.