"telegraph blue" meaning in English

{
  "etymology_text": "From the color of the telegraph paper used in France.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "telegraph blue (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1882, Godey's Lady's Book (volume 105, paeg 373)",
          "text": "Telegraph blue, similar to our cadet blue, is named after the blue telegraph paper used in France, […]"
        },
        {
          "ref": "1889, Demorests' Monthly Magazine, volume 25, page 65",
          "text": "Dark navy-blue, cardinal, golden-brown, old blue, olive, slate-gray, and telegraph-blue are the favorite solid colors seen in heavy beaver cloths […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A greyish-blue color, similar to cadet blue."
      ],
      "id": "en-telegraph_blue-en-noun-IZZ7L-Wy",
      "links": [
        [
          "cadet blue",
          "cadet blue"
        ]
      ],
      "raw_glosses": [
        "(archaic) A greyish-blue color, similar to cadet blue."
      ],
      "tags": [
        "archaic",
        "uncountable"
      ]
    }
  ],
  "word": "telegraph blue"
}

{
  "etymology_text": "From the color of the telegraph paper used in France.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "telegraph blue (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with archaic senses",
        "English terms with quotations",
        "English uncountable nouns",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "1882, Godey's Lady's Book (volume 105, paeg 373)",
          "text": "Telegraph blue, similar to our cadet blue, is named after the blue telegraph paper used in France, […]"
        },
        {
          "ref": "1889, Demorests' Monthly Magazine, volume 25, page 65",
          "text": "Dark navy-blue, cardinal, golden-brown, old blue, olive, slate-gray, and telegraph-blue are the favorite solid colors seen in heavy beaver cloths […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A greyish-blue color, similar to cadet blue."
      ],
      "links": [
        [
          "cadet blue",
          "cadet blue"
        ]
      ],
      "raw_glosses": [
        "(archaic) A greyish-blue color, similar to cadet blue."
      ],
      "tags": [
        "archaic",
        "uncountable"
      ]
    }
  ],
  "word": "telegraph blue"
}