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: Shields
RecipeMakesReagentsNeedsSkill-up
Evergreen ShieldTaught by Plans: Evergreen Shield, requires 300
Evergreen Shield
  • Blacksmith Hammer
  • Master Forge
Yellow 310Grey 325
Jagged Obsidian ShieldTaught by Plans: Jagged Obsidian Shield, requires 300
Jagged Obsidian Shield
  • Blacksmith Hammer
  • Anvil
Yellow 320Grey 340

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