If you Google (or Bing, whichever search engine you prefer) the word Perlage you’ll find an assortment of search results, some in English, others Italian.
Simply put, perlage means bubbles. But the Internet search also called up a few commercial entities that are capitalizing on the name, using it to sell a wine-saving device that restores CO2 to an opened bottle of bubbly. According to one site, if you open a bottle and can’t finish it, you don’t have to worry about it going flat. Just use their product to fill the headspace of the bottle with pressurized CO2 which helps retain the bubbles and keep oxygen from making the wine go flat.
Supposedly the wine stays good for up to 14 days. Sounds similar to the Vin-Vac that allows you to pump out unwanted air from a bottle of wine to preserve it for longer periods. We have a couple of those and they do a great job.
The next time you’re drinking bubbly, if you want to sound smart make a comment about how superb the wine’s “perlage” is.