Here’s a darker and more distinct color palette that avoids brown tones while maintaining visual contrast:

json
{
  "palette_name": "Dark Distinct Quartet",
  "colors": [
    {
      "name": "Deep Teal",
      "hex_code": "
                            
                            #004B4D
                        "
    },
    {
      "name": "Charcoal Blue",
      "hex_code": "
                            
                            #2A4D69
                        "
    },
    {
      "name": "Muted Plum",
      "hex_code": "
                            
                            #4B3C6A
                        "
    },
    {
      "name": "Slate Green",
      "hex_code": "
                            
                            #3B6E65
                        "
    }
  ]
}

This palette features rich, dark tones that are visually distinct from one another. Each color offers a unique character while still creating a cohesive and sophisticated look without any brown hues.

Would you like any further adjustments, or do you need suggestions on how to use this palette effectively?