{
  "type": "create:mixing",
  "heat_requirement": "heated",
  "ingredients": [
    {
      "item": "minecraft:copper_ingot"
    },
    {
      "tag": "c:ingots/nickel"
    }
  ],
  "results": [
    {
      "count": 2,
      "id": "tfmg:constantan_ingot"
    }
  ]
}