Each recipe is orange until its yellow rank and grey from its grey rank. When the ranks differ, it turns green somewhere between the two; the client files give both ranks but not that point. Equal ranks go straight to grey.

Blacksmithing: Miscellaneous
RecipeMakesReagentsNeedsSkill-up
Silver Skeleton Key
2 × Silver Skeleton Key
  • Blacksmith Hammer
  • Anvil
Yellow 75Grey 95
Golden Skeleton Key
2 × Golden Skeleton Key
  • Blacksmith Hammer
  • Anvil
Yellow 125Grey 145
Iron Shield SpikeTaught by Plans: Iron Shield Spike, requires 125
Iron Shield Spike
  • Blacksmith Hammer
  • Anvil
Yellow 155Grey 185
Iron CounterweightTaught by Plans: Iron Counterweight, requires 140
Iron Counterweight
  • Blacksmith Hammer
  • Anvil
Yellow 165Grey 190
Truesilver Skeleton Key
2 × Truesilver Skeleton Key
  • Blacksmith Hammer
  • Anvil
Yellow 175Grey 195
Steel Weapon ChainTaught by Plans: Steel Weapon Chain, requires 165
Steel Weapon Chain
  • Blacksmith Hammer
  • Anvil
Yellow 190Grey 215
Mithril Shield SpikeTaught by Plans: Mithril Shield Spike, requires 190
Mithril Shield Spike
  • Blacksmith Hammer
  • Anvil
Yellow 210Grey 230
Mithril SpursTaught by Plans: Mithril Spurs, requires 210
Mithril Spurs
  • Blacksmith Hammer
  • Anvil
Yellow 230Grey 250
Arcanite Skeleton Key
2 × Arcanite Skeleton Key
  • Blacksmith Hammer
  • Anvil
Yellow 250Grey 260
Thorium Shield SpikeTaught by Plans: Thorium Shield Spike, requires 250
Thorium Shield Spike
  • Blacksmith Hammer
  • Anvil
Yellow 270Grey 290

From the Forever beta client files, build 1.60.1.70630: the SkillLine, SkillLineAbility, TradeSkillCategory, SpellReagents, SpellEffect, SpellTotems, SpellCastingRequirements and ItemEffect tables.