"dead colouring" meaning in English

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      "expansion": "dead colouring (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "name": "Art",
          "orig": "en:Art",
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      "examples": [
        {
          "ref": "1829, Alexander Jamieson, A dictionary of mechanical science, arts, manufactures, and miscellaneous knowledge",
          "text": "The colours necessary for dead colouring are: common white, light ochre, brown ochre, burnt umber, Indian red, ivory black, and Prussian blue.",
          "type": "quotation"
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      ],
      "glosses": [
        "The first broad outlines of a picture."
      ],
      "id": "en-dead_colouring-en-noun-zN0-f0ua",
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          "art",
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          "broad",
          "broad"
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        [
          "outline",
          "outline"
        ],
        [
          "picture",
          "picture"
        ]
      ],
      "raw_glosses": [
        "(art) The first broad outlines of a picture."
      ],
      "tags": [
        "uncountable"
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      "topics": [
        "art",
        "arts"
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  "word": "dead colouring"
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      "expansion": "dead colouring (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:Art"
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      "examples": [
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          "ref": "1829, Alexander Jamieson, A dictionary of mechanical science, arts, manufactures, and miscellaneous knowledge",
          "text": "The colours necessary for dead colouring are: common white, light ochre, brown ochre, burnt umber, Indian red, ivory black, and Prussian blue.",
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      "glosses": [
        "The first broad outlines of a picture."
      ],
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        "(art) The first broad outlines of a picture."
      ],
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  "word": "dead colouring"
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