A one-page private mailing (reply) card from Atlas Electric Devices Co., Inc. of Chicago, used to request a bulletin on the Fade-Ometer, a lightfastness testing machine. The card argues that misrepresenting color fastness harms goodwill and sales, and promotes the slogan 'Guaranteed Fast to Light by a Fade-Ometer Test'. It includes blank lines for the date, address, and attention of the sender.