White wine the death knell of northern viticulture. The vine disappeared from northern Germany and Baden, and the maximum altitude for viticulture descended to 220 metres. Hans-Jürgen Otto noted that: "all the vineyards suffered and decreased in area". In England the vine also disappeared. The less early vineyards preferred to select white varieties of grapes because, even if unripe, white grapes allowed wine that was a little sour to still be consumable, while red grapes do not give enough colour and green tannins make the wine bitter. The interruption of the fermentation by a cold winter led to the discovery of the
Champagne design). A French term (literally "white from blacks" or "white of blacks") for a white wine produced entirely from black grapes. The flesh of grapes described as black or red is white; grape juice obtained after minimal possible contact with the skins produces essentially white wine, with a slightly yellower colour than wine from white grapes. The colour, due to the small amount of red skin pigments present, is often described as white-yellow, white-grey, or silvery. "Blanc de noirs" is often encountered in Champagne, where a number of houses have followed the lead of Bollinger's "prestige cuvée" Vieilles Vignes Françaises