Inverted polishing: Place the solder strip vertically into the mixed cold inlay material and invert the mold. After it solidifies, place it in a polishing machine to polish and present a bright mirror effect.

Metallographic microscope analysis: The polished solder strip mold can clearly display the cross-sectional tin plating situation under the metallographic microscope, and the thickness of the coating can be visually viewed through the measurement tools in the software.