In the scrapbook of our 1978, 5-country, honeymoon trip there were, from each country, a laminated page of spare change and sometimes paper money we picked up in each place. They weren’t professionally done, just two sheets of clear plastic stuck together. All the raised edges of every coin had some sort of green goo. This is probably from a chemical reaction between the metal and glue. All of the bills were impossible to separate from their plastic cocoons, except some of the bills from Taiwan. The ones that survived were the ones that were stuck between 2 other bills, so they stuck to nothing.
I don’t have the inclination to clean all the coins. But they might be worth something, as they are all from the 70s, and there are even some coins from Hong Kong while it was still under British rule. The bills from Taiwan are in yuan, and now their currency is in Taiwan dollars. Maybe I could take them to a coin dealer and see if there might be interest in buying any of this stuff.