Here is a color palette inspired by your description of “de grenat intense à xylogravure mamba alizarine”:

json
{
  "palette_name": "Intense Garnet to Mamba Alizarin",
  "colors": [
    {
      "name": "Intense Garnet",
      "hex_code": "
                            
                            #9B1B30
                        "
    },
    {
      "name": "Crimson Red",
      "hex_code": "
                            
                            #DC143C
                        "
    },
    {
      "name": "Deep Red",
      "hex_code": "
                            
                            #8B0000
                        "
    },
    {
      "name": "Mamba Alizarin",
      "hex_code": "
                            
                            #5B2E91
                        "
    },
    {
      "name": "Dark Purple",
      "hex_code": "
                            
                            #4B0082
                        "
    }
  ]
}

This palette transitions from the deep and rich tones of intense garnet through vibrant crimson to the striking hues of mamba alizarin, creating a bold and dramatic color scheme.

What kind of project or design are you considering using this color palette for?