A technical dictionary of printmaking, André Béguin.
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Double boiler
A system of pots or containers used for heating products (usually liquid or pasty) which cannot be heated directly or at a high temperature. Double boilers are usually used to heat gradually, to maintain a constant temperature, and sometimes for reasons of safety (inflamable products). If solid, the product that needs to be heated can be placed directly into a liquid that is being heated (usually water). Otherwise the solid or liquid product can be placed into a hollow container that is in turn plunged into some liquid which is being heated directly.
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