Chrome on metal always has copper, nickel and then chrome.
Not always, Ford did use just nickel then chrome, a two part process, for many years.
- if the surface isn't polished to perfection, everything shows.
This is the labor intensive part. To get a scratch out of a bumper my take several layers of copper.
Many chrome platers have moved the actual processes to Mexico to avoid the leftist EPA and the cost involved with the handling of chemicals.
In the San Francisco Bay Area, there are a couple of shops that do everything local, they spend between $6,000 and $10,000 a month on EPA compliance, but many others send their items to the Central Valley, Sacramento, Stockton, etc, where EPA and CalOSHA regulations are not as strict. Mexico is 500 miles South, but it may be used by some.
Is there such a thing as a "over restored" chrome bumpers, door handles etc?
Yes. Original chrome was just "shiny", rechromed parts today have a very deep reflection visible. It's overdone, but I like it.
Jim