I have had good luck with olive. Usually the materials I buy are the darker shade, and I caught fish, so I never paid attention to the shade.
When it comes to metallic colors, most charter captains on the lake specify silver plating on their spoons, etc., as it seems to reflect light deeper than other metal finishes (chrome, nickel, etc.) Going back to my electrochemistry background, I can tell the difference between "silvery colors" at a glance! Silver has a "whitish" cast, chrome has a "bluish" cast, and nickel has a "yellowish" cast. Some exotics, like tin/nickel (pinkish) and others that we describe as "silvery" all have their own "color", and reflect light different ways.