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.

Enchanting: Off-Hands
RecipeMakesReagentsNeedsSkill-up
Orb of Mystic InsightTaught by Formula: Orb of Mystic Insight, requires 140
Orb of Mystic InsightQuantity not confirmed
  • Runed Silver Rod
Yellow 140Grey 180
Orb of SoulsTaught by Formula: Orb of Souls, requires 140
Orb of SoulsQuantity not confirmed
  • Runed Silver Rod
Yellow 140Grey 180
Truesilver ConduitTaught by Formula: Truesilver Conduit, requires 220
Truesilver ConduitQuantity not confirmed
  • Runed Silver Rod
Yellow 225Grey 265
Twisting Essence JarTaught by Formula: Twisting Essence Jar, requires 220
Twisting Essence JarQuantity not confirmed
  • Runed Silver Rod
Yellow 225Grey 265

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