Green tinges are not unheard of, especially in youth. With time and oxidation, a golden color is common. Lychee nut, peaches and tropical fruits are all common. Since white wine is made with minimal skin contact, there is almost no tannin associated with the grapes. There is tannin that results from oak aging, but they are much lighter than the tannins associated with red wines.
Some white wines exhibit signs of astringency, a drying out of the mouth.
This is mostly found in Rhone whites and the richest Chardonnays. Wet horse blanket - Brett, a common bacterial spoilage, in smaller concentrations it is more like dirt than merde. Much rarer in whites than in reds. Oak - If it is complex with cloves and woody spices, it is French oak. If it is forward with vanilla, it is American oak.