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Chardonnay is a key grape variety in traditional Champagne blends and significantly contributes to their complexity. This grape is known for its bright acidity, which helps to create a refreshing, crisp profile in the final wine. Chardonnay also brings a range of flavors to Champagne, including notes of citrus, green apple, pear, and even subtle brioche and creaminess as it ages.

In the context of Champagne production, Chardonnay is one of the three primary grape varieties used, alongside Pinot Noir and Pinot Blanc. The inclusion of Chardonnay adds elegance and finesse to the wine, which is sought after in many premium sparkling wines. As it matures, Chardonnay can develop complexity through the influence of lees contact, particularly in terms of texture and flavor.

Other grape varieties listed do not play a role in traditional Champagne production. Pinot Grigio is primarily known for producing light, crisp wines outside of the Champagne region, while Cabernet Franc and Malbec are not typical of the Champagne blends and are more associated with still wine production in regions such as Bordeaux and Argentina, respectively. Thus, Chardonnay stands out as the variety that underpins much of the complexity found in traditional Champagne blends.