This describes a white wine made entirely from white grapes. If this sounds like stating the obvious, it is necessary because black grapes can be used to make white wine. Only grape skins impart colour; the juice and pulp are clear. This is especially true in Champagne, where the few legally permitted varieties are black grapes types like Pinot Meunier and Pinot Noir. A Blanc de Blancs describes a wine made using 100% Chardonnay, the only other legally permitted variety.