A card formed with a cavity located within the card. The cavity is used to hold one or more liquid chemicals. Additional hollow regions abut the visual and magnetic versions of the sensitive data and are normally separated from the chemicals. When the card is sharply folded, the chemicals are released from the cavity and flow in the hollow regions abutting the stored data. The chemicals render the data unreadable, such as by obscuring the visual display with an opaque film. Additionally, in at least some embodiments, the magnetic strip on the credit card is implemented in such a way that there are two separate portions, with the encoded data divided in such a way that both portions are required in order to be decoded.