User: What is the difference between blanc de noirs and blanc de blancs champagne?
Assistant: In champagne, three grape varieties are commonly used. Two of these varieties are red grapes, pinot noir and pinot meunier, and the other is a white grape, chardonnay. Blanc de blancs, meaning white of whites, represents a version of champagne that only uses white grapes, while blanc de noirs, meaning white of blacks, represents a version that uses only red grapes.