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davidcyclebackKeeping lockets of a loved one's hair has been around for a long time. You can find Daguerreotypes with the pictured person's hair in the holder. If a man was to go to war, he would take his wife's photo and hair locket and she his.
I don't know how hair is authenticated, but I'm sure provenance is part of it. I once owned Ted William's toiletries kit and the hair brush had what I assumed was Ted's hair. Considering I know it was Ted's kit and brush and the hair was his color, that narrows it down to whose hair it would have belonged.