Here is a color palette featuring 15 different shades of black:

json
{
  "palette_name": "Shades of Black",
  "colors": [
    {
      "name": "Jet Black",
      "hex_code": "
          
          #343434
       "
    },
    {
      "name": "Charcoal Black",
      "hex_code": "
          
          #2C2C2C
       "
    },
    {
      "name": "Rich Black",
      "hex_code": "
          
          #101820
       "
    },
    {
      "name": "Onyx",
      "hex_code": "
          
          #353839
       "
    },
    {
      "name": "Black Olive",
      "hex_code": "
          
          #3B3C36
       "
    },
    {
      "name": "Ebony",
      "hex_code": "
          
          #555D50
       "
    },
    {
      "name": "Raisin",
      "hex_code": "
          
          #7D4B8A
       "
    },
    {
      "name": "Dark Slate",
      "hex_code": "
          
          #2F2A25
       "
    },
    {
      "name": "Coal",
      "hex_code": "
          
          #2D2926
       "
    },
    {
      "name": "Black Bean",
      "hex_code": "
          
          #3D2A2B
       "
    },
    {
      "name": "Black Pearl",
      "hex_code": "
          
          #1C1C1C
       "
    },
    {
      "name": "Outer Space",
      "hex_code": "
          
          #4B5454
       "
    },
    {
      "name": "Gunmetal",
      "hex_code": "
          
          #2A3439
       "
    },
    {
      "name": "Dark Charcoal",
      "hex_code": "
          
          #2B2B2B
       "
    },
    {
      "name": "Shadow",
      "hex_code": "
          
          #BFBFBF
       "
    }
  ]
}

This palette showcases various shades of black, each with its unique undertone and characteristic. Do you have a specific project in mind where you want to use these colors, or are you looking for any specific combinations or contrasts?