Here is the updated color palette with Deep Purple changed to a deeper shade:

json
{
  "palette_name": "Dark Cool Jewel Tones",
  "colors": [
    {
      "name": "Deep Teal Green",
      "hex_code": "
          
          #003D3F
       "
    },
    {
      "name": "Midnight Blue",
      "hex_code": "
          
          #191970
       "
    },
    {
      "name": "Deep Red",
      "hex_code": "
          
          #5C0016
       "
    },
    {
      "name": "Dark Purple",
      "hex_code": "
          
          #3E1A78
       "
    },
    {
      "name": "Black",
      "hex_code": "
          
          #000000
       "
    }
  ]
}

This palette now features a Dark Purple that adds even more depth and richness, enhancing the overall dramatic effect. How do you plan to use this refined palette? Are you working on a specific project or theme?