19:08
Metal Refining & Recovery, Episode19: Gold From Mercury
11:30
Iodine From Salt
13:10
Proceso de refinación de plata sin ácidos
24:49
Refining Precious Metals To Pure Gold & Silver
18:11
Turning a BLOB into PURE GOLD!
19:47
Precious Metal Refining & Recovery, Episode 7: Fining Silver
13:34
How much Gold/Silver Is Inside a 7,000$ watch?
17:54