Piezoelectric Diaphragms FAQQPlease explain the reasoning behind the discoloration (from white to brown) of the electrode in the Piezoelectric Diaphragm.

A
The electrode for the Piezoelectric Diaphragm consists of Ag(Silver).
Ag(Silver) has the chemical characterization that when reacting with S(sulfur) content in the air it is tarnished to a brownish color. Please confirm solder-ability and characteristics for the products regularly as they may be degraded.
Piezoelectric Diaphragm

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