Blanc de Blancs refers to wines made from white grapes, Chardonnay, in particular, when it comes to Champagne. These tend to be crisp and elegant with vibrant orchard-fruit tones.
Blanc de Noirs refers to white sparkling wines made from red grapes, Pinot Noir and Pinot Meunier in Champagne. The juice of virtually every red grape is actually clear so a quick pressing off the skins results in white wines such as these. The flavor of the wines retains hints of red fruits and tend to be somewhat richer than their Blanc de Blanc cousins.
Rose sparkling wines are pink to quite red wines, much like the still versions. There are two ways to producing a rose. The first involves leaving the juice in contact with the skins of the red grapes for a period of time. It is also possible to produce a rose by blending red wine and white wine. Roses can be among the richest of sparkling wines and have fruit flavors that lean decidedly in the berry direction.
The terminology used to indicate the sweetness or dryness of a sparkling wine can be confusing, but at least they are consistent across most countries.
Sparkling wines labeled Brut Natural, Brut Nature, or Brut Zero have less than 3 grams per liter of residual sugar and are considered dry.
Sparking wines labeled Extra-Brut have up to 6 grams per liter of residual sugar and still taste dry but are richer and fruiter than Brut Zeros. These are perfect wines for brunch.
Sparkling wines labeled Brut have up to 15 grams per liter of residual sugar and can begin to be noticeably sweet though producers generally keep Brut fairly dry.
Sparkling wines labeled Extra Sec, Extra Seco, or Extra Dry have 12-20 grams of sugar per liter. These wines are in fact a bit sweeter as they tend to the upper end of their range
Sparkling wines labeled as Sec or Seco have between 17 and 35 grams of sugar per liter and are noticeably sweet.
Sparkling wines labeled Demi-Sec or Semi-Seco have between 33 and 50 grams per liter and are fairly sweet though the bottom end of the range still produces wines that can seem dry to the most sugar tolerant.
Wines labeled Doux or Dolce have at least 50 grams of sugar per liter and are exactly what they claim to be: Sweet.