Not sure if this relates, but I used a chromate conversion from Caswell. Caswellplating.com. Gives that subtle amber tone. Followed by a coat of Gibbs. Not sure if it can be shipped to Europe.
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Gordon
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'71 911 Coupe 3,0L
outlawed
#56 PCA Redwood Region, GGR, NASA, Speed SF
Trackrash's Garage :: My Garage