I'd like to try some of that. There are various chassis bolts and such that were original black oxide that cannot really be replicated properly in a home shop. I've been using Manganese but that doesn't offer nearly the protection of real black oxide. Blackened Zinc would be the best of both worlds, right color, great protection. There are home/shop type black oxide processes but they are not nearly as penetrating and corrosion resistant as the factory parts.
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