Here is a high contrast rainbow color palette with 16 colors:

json
{
  "palette_name": "High Contrast Rainbow",
  "colors": [
    {
      "name": "Red",
      "hex_code": "
          
          #FF0000
       "
    },
    {
      "name": "Orange",
      "hex_code": "
          
          #FF7F00
       "
    },
    {
      "name": "Yellow",
      "hex_code": "
          
          #FFFF00
       "
    },
    {
      "name": "Green",
      "hex_code": "
          
          #00FF00
       "
    },
    {
      "name": "Cyan",
      "hex_code": "
          
          #00FFFF
       "
    },
    {
      "name": "Blue",
      "hex_code": "
          
          #0000FF
       "
    },
    {
      "name": "Purple",
      "hex_code": "
          
          #7F00FF
       "
    },
    {
      "name": "Magenta",
      "hex_code": "
          
          #FF00FF
       "
    },
    {
      "name": "Brown",
      "hex_code": "
          
          #A52A2A
       "
    },
    {
      "name": "Pink",
      "hex_code": "
          
          #FFC0CB
       "
    },
    {
      "name": "Lime",
      "hex_code": "
          
          #00FF7F
       "
    },
    {
      "name": "Turquoise",
      "hex_code": "
          
          #40E0D0
       "
    },
    {
      "name": "Gold",
      "hex_code": "
          
          #FFD700
       "
    },
    {
      "name": "Coral",
      "hex_code": "
          
          #FF7F50
       "
    },
    {
      "name": "Slate",
      "hex_code": "
          
          #708090
       "
    },
    {
      "name": "Olive",
      "hex_code": "
          
          #808000
       "
    }
  ]
}

This palette features bright and vibrant colors that are highly contrasting, making it suitable for a variety of applications where visibility and distinction are key. Would you like to know how to use this palette effectively or anything else related to it?