"purple of Cassius" meaning in English

{
  "etymology_text": "Named for Andreas Cassius, a glassmaker from Potsdam who first described its creation.",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "kind": "topical",
          "langcode": "en",
          "name": "Gold",
          "orig": "en:Gold",
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            "Metallurgy",
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      "examples": [
        {
          "ref": "2002, Philip Ball, The Elements: A Very Short Introduction, Oxford, published 2004, page 61",
          "text": "Purple of Cassius was used not just by glassmakers but by porcelain manufacturers to make a fine red glaze.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A pigment formed from gold and tin salts, used in glassmaking."
      ],
      "id": "en-purple_of_Cassius-en-noun-vcYSTvlV",
      "links": [
        [
          "gold",
          "gold"
        ],
        [
          "tin",
          "tin"
        ],
        [
          "salt",
          "salt"
        ]
      ],
      "raw_glosses": [
        "(historical) A pigment formed from gold and tin salts, used in glassmaking."
      ],
      "tags": [
        "historical",
        "uncountable"
      ],
      "translations": [
        {
          "code": "it",
          "lang": "Italian",
          "sense": "pigment",
          "word": "cassio"
        }
      ],
      "wikipedia": [
        "purple of Cassius"
      ]
    }
  ],
  "word": "purple of Cassius"
}

{
  "etymology_text": "Named for Andreas Cassius, a glassmaker from Potsdam who first described its creation.",
  "head_templates": [
    {
      "args": {
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        "head": "purple of Cassius"
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      "expansion": "purple of Cassius (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "en:Gold"
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      "examples": [
        {
          "ref": "2002, Philip Ball, The Elements: A Very Short Introduction, Oxford, published 2004, page 61",
          "text": "Purple of Cassius was used not just by glassmakers but by porcelain manufacturers to make a fine red glaze.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A pigment formed from gold and tin salts, used in glassmaking."
      ],
      "links": [
        [
          "gold",
          "gold"
        ],
        [
          "tin",
          "tin"
        ],
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          "salt",
          "salt"
        ]
      ],
      "raw_glosses": [
        "(historical) A pigment formed from gold and tin salts, used in glassmaking."
      ],
      "tags": [
        "historical",
        "uncountable"
      ],
      "wikipedia": [
        "purple of Cassius"
      ]
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  ],
  "translations": [
    {
      "code": "it",
      "lang": "Italian",
      "sense": "pigment",
      "word": "cassio"
    }
  ],
  "word": "purple of Cassius"
}