[
  {
    "type": "recipe",
    "result": "hard_steel_armor",
    "category": "CC_OTHER",
    "subcategory": "CSC_OTHER_MATERIALS",
    "skill_used": "fabrication",
    "difficulty": 6,
    "//": "hardened metal tools require high fabrication, so +1 diff here",
    "time": "12 m",
    "reversible": true,
    "book_learn": [ [ "textbook_fabrication", 5 ], [ "adv_chemistry", 6 ], [ "welding_book", 5 ] ],
    "using": [
      [ "welding_standard", 5 ],
      [ "steel_standard", 12 ]
    ]
  }
]