I dug one bottle out of the ground up here in Michigan, a bottle from about 1910-1920 that had a partial label left albeit it was only a few inches down-- Banamyl. A very rare paper-label was dug intact on a competitor's bottle here. I saw it and held it-- it was a century old. I've dug 1940s bottles with partial labels. From a privy uncovered by construction, I found a shattered bottle with label still partially legible-- it was pre-WW1.Essentially, labels on bottles can be dug in many climates. Constantly saturated soil marks Michigan, a former fruitopia and still-buzzing farmland where development does't destroy and trees don't stand, other than where the sands that slowly consume everything in their path creep toward the Lake.Some people dig up old newspapers from privies and trash-pits- headlines albeit trying to read them crumbles them-- still legible. Dumps buried with dirt will keep things looking like they did when they went in. Sealed off, the items are protected over the centuries. The issue is... the label may disintegrate. I'd keep a close eye on that one. I believe, though, that this label has all but become part of the glass-- and so it should be alright. In any event, the amount of surviving label is amazing. And it looks pretty good, too. So congrats on this wonderful discovery.
Thanks Bear. Is there any such thing as a dry hole? A friend told me he dug one no water had gotten to every thing he pulled out still had the labels on them he said.
What happens 30 years from now to the label sprayed with a chemical sealant? I don't trust spraying anything on paper if I want it to last forever. Humidity, acidity level, chemical composition of chemicals and paper itself-- bad on paper and pigments. Research would tell us more. In book restoration, a huge plague for leather-bound volumes is Red Rot. Spraying it with a couple things will slow it, but in the end it will often lead to total destruction of the leather's integrity in the future.