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Abstract
Xerography is a fundamental nen development in the field of graphic arts, which depends for its operation on the two physical phenomena of electrostatics and photoconductivity. Of the five basic steps involved in making a xerographic reproduction-sensitization, exposure, development, transfer and fixing-the development process is examined in detail. The methods reviewed are development by dusting, cascade, reversal cascade, tone tray cascade, magnetic and fur brush, liquid immersion and powder cloud techniques. The advantages and limitations of each method are discussed and indications given as to which methods are likely to be used in extending xerography into the field of continuous tone and colour reproduction.