How do card backs keep opponents from identifying a player's cards?

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euchre — playing cards Euchre hand with the five highest cards if spades are trump.

Card backs are designed to prevent players from identifying cards by masking distinguishing marks that may occur during use. Originally, card backs were plain, making it easy for accidental or intentional markings to be spotted. To address this, manufacturers began printing patterns of fine dots or tartan designs, known as taroté, on the backs of the cards. These intricate patterns help obscure any wear or blemishes, ensuring that the backs remain uniform and preventing opponents from gaining an unfair advantage through card recognition.1