This publication presents the latest optimization of the single-metal deposition technique (SMD II) and its comparison with the previous version (SMD I). In this study, endeavors were made to simplify and strengthen both the reagents and the detection procedure to obtain a technique that can be implemented in a standard operational laboratory. As a result, the proposed technique is simpler and faster because the monitoring of both temperature and pH is no longer required. Most importantly, the technique is (1) more efficient, with at least ca. 50% more marks detected with SMD II in comparison with SMD I (% obtained by using split marks) and (2) more robust regarding the processing of porous samples.