I am working on a simple wood shooting box. I am going to build it out of pine to keep the cost down and I am looking for a way to age the zinc coated steel hardware. I have tried soaking the hinges in white vinigar for a couple of days. They are a little darker, about the color of pewter. I want the hardware to have a well used look. Maybe I should have bought brass. I know there are several ways to turn it black.