White Bronze Dark lightens quickly to silver with use
Rocky Mountain is made of two base metals. SILICON BRONZE with a high copper content and WHITE BRONZE with a high nickel content.
SILICON BRONZE LIGHT: Light bronze color with gloss wax finish when new will darken to medium bronze finish with time and use. Levers or knobs will dull with use.
Silicon Bronze Medium finish is the naturally aged bronze color and will slightly darken but will change very little with or without use.