Plating Question

[KevinCav]

I recently had some parts zinc plated and when I got them back they were VERY shiny--they almost looked like they had been chromed. I had expected a much duller, grayish appearing finish. When I questioned the plater he stated that when new my parts would have appeared the same way, but had become dull and gray from almost 40 years in the engine compartment. Should I believe him? If he is correct, how can I get the shiny new appearance toned down so that it looks more original? Thanks!