I looked around the internet a little bit. I may have been remembering reading about ferric chloride which is evidently used as a step before carding in basic finishing. The dip time is referred to as very short, like 10 seconds for that purpose. Does anyone recall it's use to freshen up Damascus finishes? The other possibility is logwood which blackens traps. Has anyone ever tried boiling old barrels in a logwood solution?
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