Each time a new roll of film is started at a crime scene, the first exposure should be of a card listing the case number, the date and the photographer. Each of these Photo Identifier cards has a gray scale and a color scale and has spaces for writing the necessary information to be included in the first exposure. They can also be used later in the roll of film to be placed next to a person or object to take advantage of the inch marks on the edge of the card. Submit the cards with the roll of film so the darkroom technician can match the gray scale and the colors to produce a color-accurate photograph. These cards are available in two sizes: 8 1/2" x 11" and 4" x 5 3/8". There are twenty-five sheets to the pad.