Proceedings of 12 papers delivered at the meeting that were devoted to materials, technology and testing related to coloring of plastics materials. Particular attention has been paid to in-plant coloring of plastics molding materials and related quality control. Some papers are accompanied by bibliography references. Following is a list of titles and authors: Liquid Colorants for Thermoplastics. By Howard U. Hackney. Dispersions for the Plastics Industry. By T. A. McCormack. In-Plant Coloring of Plastics: Procedure, Pitfalls and Payout. by Roger B. Doherty. Application of Mini-Computers to Industrial Color Control Problems. By Charles H. Mertz. Measurement of the Transmittance and Reflectance of Translucent Plastics. By Ruth M. Johnson, Elaine F. Keller, L. Steven Edge, and Nellie Chang. AC Technique offers Quantum Advantage in Operation of Appearance Measuring Instruments. By Robert S. Bugash. Instrument-to-Instrument Repeatability: The Key to Widespread Use of Color Measurement Instruments in the Plastics Industry. By Robert D. Rosenthal. Requirements of a Spectrophotometer/Colorimeter in a Plastics Coloring Operation. By W. A. Coppock. Specification and Measurement of Optical Properties of Translucent Materials. By William Venable, jr. Current Practices in Measuring Plastics, Including the Many Uses for Color Measurement. By Ralph Stanziola. Promise of Improved Measurement and Application. By E. T. Connor. Common Pitfalls in Measurement of Plastics. By Max Saltzman.