All grape juice is white, only the skins of purple grapes contain the dark pigment. Beaujolais, from the region that is its namesake, is made from Gamay grapes. Red wines usually trump whites in alcohol content.
The host of a dinner should take the first sip of wine to assure his guests it is not poisoned. The bung hole is the opening in a cask through which wine can be put in or taken out. Overripe grapes can make the wine taste burnt.