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.

Engineering: Camping
RecipeMakesReagentsNeedsSkill-up
Reagent Bot
Reagent BotYellow 20Grey 25
Repair BotTaught by Blueprint: Repair Bot, requires 140
Repair Bot
  • Arclight Spanner
Yellow 140Grey 145
Anarchist's WorkbenchTaught by Blueprint: Anarchist's Workbench, requires 300
Anarchist's Workbench
  • Arclight Spanner
Grey 300

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