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Carbon-Paper Packets

Carbon paper is papercoated on one side with a layer of a loosely bound dry ink or pigmented coating, usually bound with wax. It is used for making one or more copies simultaneous with the creation of an original document. Ii's used In the early days of credit cards, sales were transacted by using carbon-paper packets that fit into a simple sliding device called a zip-zap machine. The card would be put face-up in the zip-zap, a carbon-paper packet of alternating paper and carbon paper would be placed over it, and the tight-fitting slide would be run over both of them. The pressure of the slide would create an impression of the credit card number on the papers -- one for the customer, one for the merchant, one for the merchant's bank. Today, such transactions are rare; most are handled by electronic card readers that take the card information via its magnetic stripe.