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Oil of brick
Oil of brick, called by apothecaries Oleum de Lateribus and by alchemists Oil of Philosophers, was an empyreumatic oil obtained by subjecting a brick soaked in oil, such as olive oil, to distillation at a high temperature Webster's Revised Unabridged Dictionary (1913). The process initially started with pieces of brick, which were heated red hot in live coals, and extinguished in an earth half-saturated with olive oil.
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