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.

Alchemy: Flasks
RecipeMakesReagentsNeedsSkill-up
Flask of Chromatic ResistanceTaught by Recipe: Flask of Chromatic Resistance, requires 300
Flask of Chromatic Resistance
  • Alchemy Lab
Yellow 315Grey 330
Flask of Distilled WisdomTaught by Recipe: Flask of Distilled Wisdom, requires 300
Flask of Distilled Wisdom
  • Alchemy Lab
Yellow 315Grey 330
Flask of PetrificationTaught by Recipe: Flask of Petrification, requires 300
Flask of Petrification
  • Philosopher's Stone
  • Alchemy Lab
Yellow 315Grey 330
Flask of Supreme PowerTaught by Recipe: Flask of Supreme Power, requires 300
Flask of Supreme Power
  • Alchemy Lab
Yellow 315Grey 330
Flask of the TitansTaught by Recipe: Flask of the Titans, requires 300
Flask of the Titans
  • Alchemy Lab
Yellow 315Grey 330
Flask of Natural AccuracyTaught by Recipe: Flask of Natural Accuracy, requires 300
Flask of Natural Accuracy
  • Alchemy Lab
Yellow 320Grey 330
Flask of Natural AggressionTaught by Recipe: Flask of Natural Aggression, requires 300
Flask of Natural Aggression
  • Alchemy Lab
Yellow 320Grey 330
Flask of Natural PrecisionTaught by Recipe: Flask of Natural Precision, requires 300
Flask of Natural Precision
  • Alchemy Lab
Yellow 320Grey 330
Flask of Natural SwiftnessTaught by Recipe: Flask of Natural Swiftness, requires 300
Flask of Natural Swiftness
  • Alchemy Lab
Yellow 320Grey 330

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