What name did Pepsi use for its 1975 blind taste-test campaign against Coca-Cola?

Pepsi used the name Pepsi Challenge for its 1975 blind taste-test campaign against Coca-Cola.

The promotion invited consumers to taste unidentified samples of Pepsi and Coca-Cola, usually served in unbranded cups. Participants were then asked which drink they preferred. Pepsi publicized results claiming that many tasters selected Pepsi when the brands were presented without their familiar packaging.

The campaign became one of the most prominent episodes in the long-running rivalry between Pepsi and Coca-Cola. It shifted attention from market share and advertising toward the sensory experience of cola itself.

The Pepsi Challenge did not mean that every consumer preferred Pepsi, and later commentators have noted that small-sample tasting conditions can differ from normal drinking habits. Nevertheless, the campaign became a major example of comparative advertising.