Many screws appear yellow, like this
They are known as chrome plated, but, if I am not wrong, chrome plating is for having a shiny, silver like color.
What do they add that makes them yellow?
I had some oxidized screws (the oxide was white). I stripped the oxide with acetic acid. This removed the plating as well, so I plated them with nickel. This clearly changed the color to gray. I would like to restore them to the original color, how can I do that?
And, is there something other than acetic acid that only dissolves the oxide and not the plating itself?