Zinc is extremely useful alloyed with other metals for corrosion resistance which certainly has a use in practically any place. There may also be a knock-on effect from the discovery and isolation of zinc to trying the same with other metals. There probably isn't much that could be discovered and isolated in Antiquity, but perhaps it could lead to better understanding of bismuth, nickel, and cobalt, all of which were known about since Antiquity and isolated relatively early in Medieval/early modern times.What sort of uses has zinc for a pre industrial society? Besides being a prestige item I mean. Funny to think when aluminum was first discovered it was pretty difficult to use so it became one of the world's most expensive metals, comparable to gold or silver. Napoleon III had aluminum silverware to impress his guests.
Its so weird to imagine nowadays european royalty flaunting aluminum jewelry.
If you have industries for producing these substances, and these industries survive the chaos of Late Antiquity, then they'd probably be accelerating society's knowledge of chemistry and metallurgy over the centuries.