In the depicted travel-booking interface, selected dates appear in red against a purple background. Reusing the brand's primary red for the date-selection state creates a consistent association between that color and choosing travel dates.

University of Michigan - Ann Arbor

Google

Color should be used consistently in a product's user interface so that certain colors always convey the same meaning. Attention must also be given to colors with local or cultural significance; for example, alerts may typically be colored red in some cultures but have different connotations in others.

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