"caput mortuum" meaning in English

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  "lang_code": "en",
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        "Worthless residue of sublimation or distillation."
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          "text": "Were they working their way through the colours and now had reached the more abstruse layers of the spectrum? What would be next — caput mortuum, heliotrope? The colours of the day.",
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        "Cardinal purple, a variety of haematite iron oxide pigment."
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