I'm vacillating on this one. The more I look at it some of it looks like natural streaking.
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If you look at it against a light it goes almost all the way through on the one pivot end so I'm not sure if it matters. If I can't get it to come out by soaking and scrubbing then I'd either have to live with it or cut so much out there would just be a thin veneer of horn on the outside if that. It's still a little cloudy in some spots so I'm thinking Neatsfoot might clear it up some but I obviously don't want to do that before repairs so I guess I have to just make a decision and live with it.