Here’s the updated color palette with the specified shade of blue:

json
{
  "palette_name": "Masculine Oak",
  "colors": [
    {
      "name": "Black",
      "hex_code": "
                            
                            #000000
                        "
    },
    {
      "name": "Forest Green",
      "hex_code": "
                            
                            #2E3A2B
                        "
    },
    {
      "name": "Burnt Sienna",
      "hex_code": "
                            
                            #E45D2D
                        "
    },
    {
      "name": "Blue Gray",
      "hex_code": "
                            
                            #729EB2
                        "
    },
    {
      "name": "Warm Antique Gold",
      "hex_code": "
                            
                            #D6A25B
                        "
    }
  ]
}

The Blue Gray ( #729EB2 ) adds a subtle coolness to the palette while complementing the warmer tones and maintaining the masculine feel.

Would you like any recommendations on how to implement this color scheme in your design or decor?