Usually between 12 and 18c. The fuller the wine, the higher up on those number.
We have an off license/wine shop that I managed for a bit around 20 years ago and was sent on certified evening courses about wines and whiskeys, think level 5 was diploma and official wine master level or whatever the term is, I went to level 2 or 3 before fokin' off to much sunnier and happier climes. After 20 years that's pretty much the only bit of information I retain from them.![]()