question: Analyze the chemical composition data of the pigments used in ancient cave paintings and provide evidence supporting their geographical origin. Provide your findings in a JSON format with at least 3 pieces of evidence in a bullet list. Each piece of evidence should include the pigment type, chemical signature, and the suggested origin.
  
  Example JSON format:
  
  ```json
  {
    "evidence": [
      {
        "pigment_type": "E1",
        "chemical_signature": "Signature1",
        "suggested_origin": "Origin1"
      },
      {
        "pigment_type": "E2",
        "chemical_signature": "Signature2",
        "suggested_origin": "Origin2"
      },
      {
        "pigment_type": "E3",
        "chemical_signature": "Signature3",
        "suggested_origin": "Origin3"
      }
    ]
  }
  ```
  
  Ensure each entry in the list is formatted as per the example JSON structure.
answer: ```json
  {
    "evidence": [
      {
        "pigment_type": "Ochre Red",
        "chemical_signature": "Iron oxide (Fe2O3) with trace elements of manganese",
        "suggested_origin": "Southern France"
      },
      {
        "pigment_type": "Charcoal Black",
        "chemical_signature": "Carbon-based with traces of calcium carbonate",
        "suggested_origin": "Altamira, Northern Spain"
      },
      {
        "pigment_type": "Yellow Ochre",
        "chemical_signature": "Goethite (FeO(OH)) with minor silica content",
        "suggested_origin": "Central Italy"
      }
    ]
  }
  ```