Ken Hurst used to soak CCH parts in toilet bowl cleaner, then rub them down with with a light pad. It produced that light gray finish which some call a "French Gray". The case colors have been neutralized. The colors are only a few atoms thick.

http://www.doublegunshop.com/forums/ubbt...=true#Post39899

Fake CCH is usually done with cold blue and iodine. Though all sorts of potions have been used.

Pete


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