[sdiy] Chemical Synth

[Doug Forbes]

Saltwater and dissimilar metals will develop a small voltage. The
combination acts as a battery. Chemical rectifiers work the same way. So it
is likely that the combination would produce some variation in voltage as
the ion exchange takes place. I suspect that if there is this effect that
table salt in water would do the same thing and that if this is the
mechanism producing the sound saltwater from the ocean has little to do with
it.

Doug Forbes