"permanent white" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "barium sulphate used as a white pigment or paint, in distinction from white lead, which tarnishes and darkens from the formation of the sulphide."
      ],
      "id": "en-permanent_white-en-noun-LqWtknwA",
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        [
          "chemistry",
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        [
          "barium sulphate",
          "barium sulphate"
        ],
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          "white lead",
          "white lead"
        ]
      ],
      "raw_glosses": [
        "(chemistry) barium sulphate used as a white pigment or paint, in distinction from white lead, which tarnishes and darkens from the formation of the sulphide."
      ],
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        "uncountable"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
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    }
  ],
  "word": "permanent white"
}

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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "barium sulphate used as a white pigment or paint, in distinction from white lead, which tarnishes and darkens from the formation of the sulphide."
      ],
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "barium sulphate",
          "barium sulphate"
        ],
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          "white lead",
          "white lead"
        ]
      ],
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        "(chemistry) barium sulphate used as a white pigment or paint, in distinction from white lead, which tarnishes and darkens from the formation of the sulphide."
      ],
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        "uncountable"
      ],
      "topics": [
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  "word": "permanent white"
}