I saw something about a year and a half ago concerning a company that makes metal patinas that will replicate this chemical case coloring. It was not Steel FX. These were much bolder colors. I wish I could remember who it was making these, they even had a nice video showing how to color a receiver. Best I can recall, someone over on the 16 ga. site posted it, possibly as a reply. if I find out I will pass it along for anyone wanting to restore theirs.
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