My glass was from barrel #4, but I doubt there is a big difference in quality between the barrels.
Greasy, obviously young stuff. Paint remover and other woodshop chemicals. Oil drums with a bit of spillover. Unsweetened vispipuuro ( https://en.wikipedia.org/wiki/Vispipuuro ) and some petrol.
Moonshine alert! Young make, yeast. Sawed planks and sawdust. Cheap rye bread.