The color change on a bond finger or ball pad usually indicates an anomaly occurs in the bond finger or ball pad. For example, a scratch on the bond finger may exposure nickel underneath and cause the change of color. Accordingly, the research of flaw det The color change on a bond finger or ball pad usually indicates an anomaly occurs in the bond finger or ball pad. For example, a scratch on the bond finger may exposure nickel underneath and cause the change of color. Accordingly, the research of flaw det
