Calibration system for reflection densitometers

摘要: In a reflection densitometer calibration system, standard comprises paper sheet having color zones printed thereon, including the colors white, black, and shades of blue, red yellow. The is laminated between two transparent plastic sheets which enclose form protective covering over zones. Strips writing accepting material are then secured to outer surface layer overlies After fabricated, optical densities determined by means master densitometer. An indication density each zone written on portion strip adjacent zone. ready for use in calibrating densitometers.