What is the primary serving glass for a Black Velvet cocktail?

The primary serving glass for a Black Velvet cocktail is the champagne glass. This cocktail is traditionally made by combining equal parts of stout (usually Guinness) and sparkling wine or champagne. The use of a champagne glass enhances the visual appeal of the drink, allowing the drinker to enjoy the layered effect created by the contrasting colors of the dark stout and the light-colored sparkling wine. The aroma and effervescence of the sparkling wine are better appreciated in a glass designed for those characteristics, making the champagne glass the perfect choice for this distinctive cocktail.

While the other glass types listed have their own specific uses in cocktail serving, they do not complement the unique aspects of a Black Velvet cocktail in the same way. The stout's richness and the sparkling wine's bubbliness are best expressed in the shape and style of a champagne glass.