Here is the updated color palette with a different accent color added, maintaining the overall subdued and professional look suitable for an Excel chart:

json
{
  "palette_name": "Subtle Earth Tones with New Accent",
  "colors": [
    {
      "name": "Muted Sage",
      "hex_code": "
                            
                            #B7C9A5
                        "
    },
    {
      "name": "Sage Green",
      "hex_code": "
                            
                            #A3BFAF
                        "
    },
    {
      "name": "Dusty Blue",
      "hex_code": "
                            
                            #A3B7C9
                        "
    },
    {
      "name": "Soft Blue",
      "hex_code": "
                            
                            #8DA3B7
                        "
    },
    {
      "name": "Warm Gray",
      "hex_code": "
                            
                            #B0B3B8
                        "
    },
    {
      "name": "Light Gray",
      "hex_code": "
                            
                            #D1D3D4
                        "
    },
    {
      "name": "Muted Brick",
      "hex_code": "
                            
                            #C84A3D
                        "
    },
    {
      "name": "Soft Brick",
      "hex_code": "
                            
                            #D67F6D
                        "
    },
    {
      "name": "Accent Slate Blue",
      "hex_code": "
                            
                            #6A7B9D
                        "
    }
  ]
}

This palette, “Subtle Earth Tones with New Accent,” features a slate blue accent color that can be effectively used to highlight key data points in your Excel chart while still blending well with the overall subdued theme.

Would you like any tips on applying this palette or specific guidance on your Excel chart design?