(Reuters) - Wine labeling remains a highly confusing affair.The challenges range from the place-specific labels on most French, Italian and Spanish wines (such as Montrachet, Chianti and Rioja) that require a good deal of knowledge to understand what's actually in the bottle, to the continuing use of "Champagne" as a generic word for sparkling wines. The last time I checked, Duck Walk Vineyards had not joined Pol Roger, Moet or Bollinger as a genuine Champagne producer.