69 rear spoiler nut finish

[Danzo]

On the nuts , how is the "gold" finish achieved?
Thanks, Doc

[rszmjt]

Pretty sure they are gold iridited .  Later cars are sometimes grey or black phosphate Keps nuts.

[169INDY]

Generaly Zinc & Cadnium Plating is or can be; Post treated rendering the "GOLDISH" finish.
Hexavalent Chromates
These can be applied to electroplated parts after the plating process has been completed.  As a result the corrosion, wear and abrasion resistance of the part are dramatically improved.  These include clear, black, olive drab and yellow.