A technical dictionary of printmaking, André Béguin.

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heating
  1. In aquatint and in grain photogravure the plate is heated after having received a deposit of resin or asphaltum grain. This heating is done in order to fix the grain to the plate.
  2. Oily inks are made using a certain amount of oil. This oil may be thicker or thinner according to the heating (cooking) it has undergone. The thinnest type of oil is the one that has been cooked the least, about half an hour, while the thickest oil is cooked much longer. This heating or cooking of the oil is then followed up with a burning which degreases it. Oil that is not heated is called raw oil (such as raw linseed oil).
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