To confirm the formation voltage, the sample was stripped to the dielectric using a two -step acid digestion
process. During Electro-Chemical Processing (ECP), each formation voltage causes a tantalum anode to
reflect a specific color which clearly distinguishes its formation voltage . The color of the stripped anode
was compared to a standard anode color chart and was shown to reflect the appropriate formation voltage
for a 25-volt component. An evident leakage site was identified on the same spot that was confirmed from
cross section (corresponding to the bottom side of anode), identified with red arrow in pictures below