Chardonnay has quite a neutral 'vinery/wine' taste and will change it's taste dramatically depending on where and how it's been grown and produced - more than most other grape. Aromas will vary from stone fruit (peach) citrus notes (lemon) and tropical fruit such as pineapple. It is produced oaked or unoaked.
Sauvignon Blanc is a fresh and zesty wine with flavours of gooseberry and green pepper and high acidity. It is rarely oaked, so won't age very well and should really be drunk within a year or two of vintage to ensure it's still fresh and zesty.
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This grape is called Pinot Grigio (from Italy) or Pinot Gris (from France) and the wines produced are very different in style.
Pinot Grigio is typically dry, acidic with a light body and quite a neutral taste.
Pinot Gris is more full bodied, dry to off dry with medium acidity - sometimes with hints of tropical fruit favours and a spiciness.
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Chenin Blanc is a white grape variety with high acidity levels and can express very different flavours but will normally be quite honeyed with apricot and some green apple notes. It is normally medium to full bodied.
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