"accidental colour" meaning in English

{
  "forms": [
    {
      "form": "accidental colours",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "accidental colour (plural accidental colours)",
      "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"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Optics",
          "orig": "en:Optics",
          "parents": [
            "Physics",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A colour depending on the hypersensibility of the retina of the eye for complementary colours. They are purely subjective sensations of colour which often result from the contemplation of actually coloured bodies."
      ],
      "id": "en-accidental_colour-en-noun-YcAyNNFP",
      "links": [
        [
          "optics",
          "optics"
        ],
        [
          "hypersensibility",
          "hypersensibility"
        ],
        [
          "retina",
          "retina"
        ],
        [
          "eye",
          "eye"
        ],
        [
          "complementary colour",
          "complementary colour"
        ],
        [
          "subjective",
          "subjective"
        ],
        [
          "sensation",
          "sensation"
        ]
      ],
      "raw_glosses": [
        "(optics) A colour depending on the hypersensibility of the retina of the eye for complementary colours. They are purely subjective sensations of colour which often result from the contemplation of actually coloured bodies."
      ],
      "topics": [
        "engineering",
        "natural-sciences",
        "optics",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "accidental colour"
}

{
  "forms": [
    {
      "form": "accidental colours",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "accidental colour (plural accidental colours)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Optics"
      ],
      "glosses": [
        "A colour depending on the hypersensibility of the retina of the eye for complementary colours. They are purely subjective sensations of colour which often result from the contemplation of actually coloured bodies."
      ],
      "links": [
        [
          "optics",
          "optics"
        ],
        [
          "hypersensibility",
          "hypersensibility"
        ],
        [
          "retina",
          "retina"
        ],
        [
          "eye",
          "eye"
        ],
        [
          "complementary colour",
          "complementary colour"
        ],
        [
          "subjective",
          "subjective"
        ],
        [
          "sensation",
          "sensation"
        ]
      ],
      "raw_glosses": [
        "(optics) A colour depending on the hypersensibility of the retina of the eye for complementary colours. They are purely subjective sensations of colour which often result from the contemplation of actually coloured bodies."
      ],
      "topics": [
        "engineering",
        "natural-sciences",
        "optics",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "accidental colour"
}