Here is a color palette designed specifically for Excel tables where black text can be easily read:

json
{
  "palette_name": "Readable Excel Colors",
  "colors": [
    {
      "name": "Light Gray",
      "hex_code": "
          
          #D3D3D3
       "
    },
    {
      "name": "Pale Yellow",
      "hex_code": "
          
          #FFFFE0
       "
    },
    {
      "name": "Lavender",
      "hex_code": "
          
          #E6E6FA
       "
    },
    {
      "name": "Light Blue",
      "hex_code": "
          
          #ADD8E6
       "
    },
    {
      "name": "Mint Green",
      "hex_code": "
          
          #98FB98
       "
    },
    {
      "name": "Peach",
      "hex_code": "
          
          #FFDAB9
       "
    },
    {
      "name": "Light Coral",
      "hex_code": "
          
          #F08080
       "
    },
    {
      "name": "Sky Blue",
      "hex_code": "
          
          #87CEEB
       "
    },
    {
      "name": "Light Salmon",
      "hex_code": "
          
          #FFA07A
       "
    },
    {
      "name": "Pale Turquoise",
      "hex_code": "
          
          #AFEEEE
       "
    },
    {
      "name": "Honeydew",
      "hex_code": "
          
          #F0FFF0
       "
    },
    {
      "name": "Thistle",
      "hex_code": "
          
          #D8BFD8
       "
    },
    {
      "name": "Light Steel Blue",
      "hex_code": "
          
          #B0C4DE
       "
    },
    {
      "name": "Lavender Blush",
      "hex_code": "
          
          #FFF0F5
       "
    },
    {
      "name": "Misty Rose",
      "hex_code": "
          
          #FFE4E1
       "
    },
    {
      "name": "Light Goldenrod Yellow",
      "hex_code": "
          
          #FAFAD2
       "
    },
    {
      "name": "Cornsilk",
      "hex_code": "
          
          #FFF8DC
       "
    },
    {
      "name": "Light Green",
      "hex_code": "
          
          #90EE90
       "
    },
    {
      "name": "Powder Blue",
      "hex_code": "
          
          #B0E0E6
       "
    },
    {
      "name": "Sea Shell",
      "hex_code": "
          
          #FFF5EE
       "
    },
    {
      "name": "Alice Blue",
      "hex_code": "
          
          #F0F8FF
       "
    },
    {
      "name": "Light Pink",
      "hex_code": "
          
          #FFB6C1
       "
    },
    {
      "name": "Lemon Chiffon",
      "hex_code": "
          
          #FFFACD
       "
    },
    {
      "name": "Floral White",
      "hex_code": "
          
          #FFFAF0
       "
    },
    {
      "name": "Light Cyan",
      "hex_code": "
          
          #E0FFFF
       "
    }
  ]
}

This palette includes a variety of light colors that will provide sufficient contrast against black text, making it easy to read in an Excel table.

Would you like to know how to apply these colors in Excel or need any further assistance?