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100.36.22.110
In Reply to: RE: Cleaning heavily oxidized vintage RCA jacks? posted by Funky Bob on April 27, 2023 at 05:24:55
IF the connector is silver - then the coating is silver sulfide. Silver sulfide is brownish to black in color and is an insulator.
A quick way to determine it is silver sulfide is to rub the tarnish with your fingers. If it rubs off it is silver sulfide, and the base is silver. If it is indeed silver use a silver polish or your fingers to remove the coating.
Another way is to take the connector to a jeweler. They may be able to identify the base metal and remove the coating or recommend a possible solution.
DaveT
Follow Ups:
Where's the sulfer come from?
Doesn't Silver have an Oxide? I don't know how much energy this takes to form. We made product (silicon wafers / semiconductors) which were back coated with Silver as the TOP layer of 3 metals.....And never worried about oxidation.
Too much is never enough
Replace the old jacks.
Just under 200° C, silver sulfide conducts electricity through the transfer of ions. This is known as electrolytic conduction. At higher temperatures, silver sulfide conducts electricity as do most metallic conductors, which is through the movement of electrons. This is known as metallic conduction.
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