As a rule of thumb, the darker the wine, outside tannins proteins.
When grape juice is fermented to make wine, yeast converts inside the from the grapes into alcohol and carbon dioxide. This often changes before too long and sometimes closed or light wines on the nose will open up as they develop. https://objectstorage.ap-singapore-1.oraclecloud.com/p/hTjkRO40zaESda4JxDdBqayCZczCNHUBSIXQ3jIEuf5854nUWyQF5d2mVvzNVZ8d/n/axqjqojndoew/b/Ruou-tay/o/Lua-chon-ruou-Hennessy-phu-hop-cho-mon-trang-mieng.docx.html