[Boatanchors] The black silver contacts

[Peter Burbank]

Hi gang,
Just as many of us have suspected for years, the notorious "black stuff" 
that makes bandswitches
intermittent and the roller coil in your tuner crackle and spark is not 
conductive. First of all it's
not silver oxide but silver sulfide. Google strikes again and here it is in 
writing from the people
who seem to know and see all......the insurance industry.

 From the "Container Handbook" "Cargo Loss Prevention Information from 
German marine insurers."
"Hydrogen Sulfide reacts with silver to form silver sulfide (AG2S) which 
results in the formation of
a black film of insulating sulfides on the surface of silvered circuit 
contacts and relays and on
silvered conductors (e.g. coils)."
Does any one know of a contact cleaner that removes the black film? The 
best cleaner I ever used
was the red "Contactene" sold by GC in the '50s but it was banned due to 
carbon tet content.
73
Pete NV4V


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