Sorry if this has been discussed before, but I see all of these vintage horn posts where people advertise the % original lacquer left on the horn. I get the rough estimate technique where one might look at the horn and say "it's got about 50% left," but now I'm starting to see things like 97%, 85%, etc. Unless someone came up with a way to measure the surface area of the horn and the surface area of the lacquer, these exact percentages seem like a load of bull. Is there actually a proper method for measuring this or is it all just a "guess on the high side to make it sell better?"

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