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: Leather Headgear
RecipeMakesReagentsNeedsSkill-up
Bent GogglesTaught by Schematic: Bent Goggles, requires 200
Bent Goggles
  • Arclight Spanner
  • Gyromatic Micro-Adjustor
  • Anarchist's Workbench
Yellow 205Grey 210

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