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.

Mining: Camping
RecipeMakesReagentsNeedsSkill-up
Lodestone
LodestoneYellow 20Grey 25
Rock GardenTaught by Blueprint: Rock Garden, requires 140
Rock GardenYellow 140Grey 145
Molten FoundryTaught by Blueprint: Molten Foundry, requires 300
Molten FoundryGrey 300

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