Here is an extended color palette suitable for a graph on a dark background:

json
{
  "palette_name": "Dark Background Graph Palette",
  "colors": [
    {
      "name": "Vibrant Pink",
      "hex_code": "
                            
                            #dc4c76
                        "
    },
    {
      "name": "Golden Yellow",
      "hex_code": "
                            
                            #efbd5d
                        "
    },
    {
      "name": "Deep Blue",
      "hex_code": "
                            
                            #456bb5
                        "
    },
    {
      "name": "Bright Green",
      "hex_code": "
                            
                            #36ab3b
                        "
    },
    {
      "name": "Magenta",
      "hex_code": "
                            
                            #d14fcd
                        "
    },
    {
      "name": "Teal",
      "hex_code": "
                            
                            #3fcec8
                        "
    },
    {
      "name": "Crimson Red",
      "hex_code": "
                            
                            #da4e4f
                        "
    },
    {
      "name": "Vibrant Orange",
      "hex_code": "
                            
                            #ffa623
                        "
    },
    {
      "name": "Electric Purple",
      "hex_code": "
                            
                            #8a3ffc
                        "
    },
    {
      "name": "Soft Turquoise",
      "hex_code": "
                            
                            #4bc3e8
                        "
    },
    {
      "name": "Lime Green",
      "hex_code": "
                            
                            #a0d700
                        "
    },
    {
      "name": "Coral",
      "hex_code": "
                            
                            #ff6f61
                        "
    },
    {
      "name": "Bright Magenta",
      "hex_code": "
                            
                            #d81b60
                        "
    },
    {
      "name": "Sunshine Yellow",
      "hex_code": "
                            
                            #f6eb61
                        "
    }
  ]
}

This palette includes a variety of vibrant colors that will stand out against a dark background, ensuring good visibility and aesthetic appeal for your graph.

Would you like any specific adjustments or further additions to this palette?