Just opend a bottle of wine that had a very pretty sealant. The cork was inset about 1/4 inch. And it looked like some type of greenish resin was added to the top - and given a swirl of inner glittery gold to create a pattern in the resin. Sort of like what you might see in a pricey coffee. I didn’t think it was wax because it was tough and flexible. It would bend quite bit before it would break, and was difficult to tear. It was stuck onto the top of the cork, but appeared to be applied so that it didn’t quite flow outward to reach the glass. I tried to google this but all I got was some old patent information. Is this a product that is available to the home winemaker? It’s very pretty imho.