I used forge:dyes/blue and forge:dyes/black in a recipe for my mod (below), but they don’t include blue dye and black dye. They include lapis and ink sacs, which I don’t think is right because blue dye and black dye were added in 1.14. I didn’t test forge:dyes/brown and forge:dyes/white, but I’m sure it is the same for them. I believe this is an issue so I am bringing it to your attention. Thank you.

 

 

Spoiler

{
  "type": "minecraft:crafting_shapeless",
  "ingredients": [
    {
      "item": "minecraft:cobblestone"
    },
    {
      "tag": "forge:dyes/red"
    },
    {
      "tag": "forge:dyes/orange"
    },
    {
      "tag": "forge:dyes/yellow"
    },
    {
      "tag": "forge:dyes/green"
    },
    {
      "tag": "forge:dyes/blue"
    },
    {
      "tag": "forge:dyes/purple"
    },
    {
      "tag": "forge:dyes/pink"
    },
    {
      "tag": "forge:dyes/black"
    }  
  ],
  "result": {
    "item": "cademod:firstblock"
  }
}

 

 

This was fixed by this pull request for 1.14.3. Update to the latest 1.14.3 version of Forge.