Here is a color palette featuring 20 light pastel colors that will allow black text to show through effectively:

json
{
  "palette_name": "Light Pastel Palette",
  "colors": [
    {
      "name": "Pastel Pink",
      "hex_code": "
                            
                            #FFD1DC
                        "
    },
    {
      "name": "Pastel Blue",
      "hex_code": "
                            
                            #A7C6ED
                        "
    },
    {
      "name": "Pastel Green",
      "hex_code": "
                            
                            #B2E0B2
                        "
    },
    {
      "name": "Pastel Yellow",
      "hex_code": "
                            
                            #FFF5BA
                        "
    },
    {
      "name": "Pastel Lavender",
      "hex_code": "
                            
                            #E6C9E2
                        "
    },
    {
      "name": "Pastel Peach",
      "hex_code": "
                            
                            #FFE6B2
                        "
    },
    {
      "name": "Pastel Mint",
      "hex_code": "
                            
                            #B2E6E0
                        "
    },
    {
      "name": "Pastel Coral",
      "hex_code": "
                            
                            #FFB3B3
                        "
    },
    {
      "name": "Pastel Lilac",
      "hex_code": "
                            
                            #D7B2E3
                        "
    },
    {
      "name": "Pastel Sky Blue",
      "hex_code": "
                            
                            #A3D1E0
                        "
    },
    {
      "name": "Pastel Lemon",
      "hex_code": "
                            
                            #F6EAB6
                        "
    },
    {
      "name": "Pastel Salmon",
      "hex_code": "
                            
                            #FFCCCB
                        "
    },
    {
      "name": "Pastel Aqua",
      "hex_code": "
                            
                            #AEEEEE
                        "
    },
    {
      "name": "Pastel Periwinkle",
      "hex_code": "
                            
                            #C5C1E3
                        "
    },
    {
      "name": "Pastel Cream",
      "hex_code": "
                            
                            #FFFDD0
                        "
    },
    {
      "name": "Pastel Rose",
      "hex_code": "
                            
                            #FFB3D1
                        "
    },
    {
      "name": "Pastel Olive",
      "hex_code": "
                            
                            #D7E3B8
                        "
    },
    {
      "name": "Pastel Gray",
      "hex_code": "
                            
                            #D3D3D3
                        "
    },
    {
      "name": "Pastel Indigo",
      "hex_code": "
                            
                            #B2A2D2
                        "
    },
    {
      "name": "Pastel Mustard",
      "hex_code": "
                            
                            #E6D88A
                        "
    },
    {
      "name": "Pastel Raspberry",
      "hex_code": "
                            
                            #FF6F81
                        "
    }
  ]
}

This palette consists of soft pastel shades that are light enough to ensure that black text remains legible. Would you like to explore any specific color combinations or applications for this palette?