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: Camping
RecipeMakesReagentsNeedsSkill-up
Mana Well
Mana WellYellow 20Grey 25
FermenterTaught by Blueprint: Fermenter, requires 140
FermenterYellow 140Grey 145
Alchemy LaboratoryTaught by Blueprint: Alchemy Laboratory, requires 300
Alchemy LaboratoryGrey 300

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