Abstract: A color control system for color separation, developing and printing fields including a plurality of strips of film with each strip containing color information and combining to form a color proof. A proof can be analyzed by eye or compared with a control wedge with conforming color information. The proof includes grey balance material visible from highlight through shadow to render grey when all colors are trapping correctly and show color differences on the proof when the colors are not trapping correctly. Color change indicators are on the proof to indicate unacceptable two color combination or an excess of a percentage of a contaminating color in a three color arrangement. Slur controls are on the proof to determine color slurring and permit the analysis of the percentage of color slurring when the proof is compared with later proofs or a control wedge.