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From the Wikipedia definition of propaganda:
Propaganda can be classified according to the source and nature of the message.
White propaganda generally comes from an openly identified source, and is characterized by gentler methods of persuasion, such as standard public relations techniques and one-sided presentation of an argument.
Black propaganda often pretends to be from a friendly source, but is actually from an adversary. Black propaganda is characterized by its presentation of false information to elicit a desired response, and is often used in covert military psychological operations and by large networked organizations such as terror networks or governments.
Gray propaganda may come from an adversarial source pretending to be friendly or neutral, and presents misleading information in a more insidious manner than white propaganda.