First & foremost let may say that I am no salmon expert. Having said that we know that Coho is called silver because they like to bite the things that are silver. Increasing the silverocity of your lure will increase the odds of catching silver under any condition. If the conditions under which you are fishing are not optimal, the silver in your lure will still increase however small chance you have. Nothing better than catching a silver silver which is the same as silver coho on a silver lure. If the conditions are optimal and anything is catching fish then using silver will help you catch more. In low light conditions, silver shines even more and it will increase your chances. There is no substitute for a real silver lure. Price of silver may go up tomorrow.

I am STIHLHEAD and I approve this hypothesis.
Further investigation required.
Your experience may vary.
Use at your own risk.
Do not allow children near silver lures or sharp objects.
Tetanus shots are recommended.
Not responsible for lost lures or dismal fishing conditions.