The official Daimler chroming specification was:
"A minimum of 22 microns of nickel must be laid down on the brass, finished with nickel sealer then chrome plated for 7.1/2 minutes"
Note that it is usual when plating steel to first plate with copper.
The most important part of plating is not to apply the chromium too thick (because it is brittle and will crack). Consider the chrome as a form of varnish - it protects and provides a gloss finish, but should not obscure the underlying surface.
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