"Eschel blue" meaning in English

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          "ref": "1874, Jean René Denis Riffault des Hêtres, Armand Denis Vergnaud, G. Alvar Toussaint, A Practical Treatise on the Manufacture of Colors for Painting, Comprising the Origin, Definition, and Classification of Colors; the Treatment of the Raw Materials Etc, page 352:",
          "text": "Independently of the ordinary smalt, there is another darker blue, with a very fine grain, and which is generally called Eschel blue or Laundry blue.",
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        "A specific shade of blue, a trademarked color name."
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  "word": "Eschel blue"
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