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.

Cooking: Soothing Drinks
RecipeMakesReagentsNeedsSkill-up
Peace TeaTaught by Recipe: Peace Tea, requires 25
Peace Tea
  • Cooking Fire
Yellow 30Grey 45
Royal TeaTaught by Recipe: Royal Tea, requires 100
Royal Tea
  • Cooking Fire
Yellow 105Grey 125
Root TeaTaught by Recipe: Root Tea, requires 125
Root Tea
  • Cooking Fire
Yellow 155Grey 185
Triage TeaTaught by Recipe: Triage Tea, requires 180
Triage Tea
  • Cooking Fire
Yellow 195Grey 235
Sunny TeaTaught by Recipe: Sunny Tea, requires 200
Sunny Tea
  • Cooking Fire
Yellow 220Grey 250
Sage's TeaTaught by Recipe: Sage's Tea, requires 250
Sage's Tea
  • Cooking Fire
Yellow 260Grey 290

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