The present invention relates to compositions comprising phosphonate metal chelants, chelating agents, and ferrous ions at a pH of about 5 to about 10, and methods of using the compositions. The coherent receiver can blindly determine a delay between the set of in-phase signals and the set of quadrature signals based on the set of in-phase signals and the set of quadrature signals. In executing a procedure utilizing the aforementioned system, the markings associated with the tools and dies are detached from these tools and dies and are subsequently scanned.