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.

Leatherworking: Mail Boots
RecipeMakesReagentsNeedsSkill-up
Mender's Mail BootsTaught by Pattern: Mender's Mail Boots, requires 200
Mender's Mail Boots
  • Tanning Rack
Grey 205
Skirmisher's Mail BootsTaught by Pattern: Skirmisher's Mail Boots, requires 200
Skirmisher's Mail Boots
  • Tanning Rack
Grey 205
Skycaller's Mail BootsTaught by Pattern: Skycaller's Mail Boots, requires 200
Skycaller's Mail Boots
  • Tanning Rack
Grey 205
Stalker's Mail BootsTaught by Pattern: Stalker's Mail Boots, requires 200
Stalker's Mail Boots
  • Tanning Rack
Grey 205
Tough Scorpid BootsTaught by Pattern: Tough Scorpid Boots, requires 210
Tough Scorpid BootsYellow 230Grey 250
Supple Scorpid BootsTaught by Pattern: Supple Scorpid Boots, requires 230
Supple Scorpid BootsYellow 250Grey 270
Mender's Mail SabatonsTaught by Pattern: Mender's Mail Sabatons, requires 235
Mender's Mail SabatonsYellow 255Grey 275
Skirmisher's Mail SabatonsTaught by Pattern: Skirmisher's Mail Sabatons, requires 235
Skirmisher's Mail SabatonsYellow 255Grey 275
Skycaller's Mail SabatonsTaught by Pattern: Skycaller's Mail Sabatons, requires 235
Skycaller's Mail SabatonsYellow 255Grey 275
Stalker's Mail SabatonsTaught by Pattern: Stalker's Mail Sabatons, requires 235
Stalker's Mail SabatonsYellow 255Grey 275
Heavy Scorpid BootsTaught by Pattern: Heavy Scorpid Boots, requires 255
Heavy Scorpid BootsYellow 275Grey 295
Broodwatcher's TreadersTaught by Pattern: Broodwatcher's Treaders, requires 295
Broodwatcher's Treaders
  • Sewing Machine
Yellow 295Grey 300
Scalegut TreadersTaught by Pattern: Scalegut Treaders, requires 295
Scalegut Treaders
  • Sewing Machine
Yellow 295Grey 300
Charged Scorpid BootsTaught by Pattern: Charged Scorpid Boots, requires 280
Charged Scorpid BootsYellow 300Grey 320
Heavy Timbermaw BootsTaught by Pattern: Heavy Timbermaw Boots, requires 295
Heavy Timbermaw Boots
  • Sewing Machine
Yellow 300Grey 320
Supple Scorpid SabatonsTaught by Pattern: Supple Scorpid Sabatons, requires 280
Supple Scorpid SabatonsYellow 300Grey 320
Spiritcaller BootsTaught by Pattern: Spiritcaller Boots, requires 300
Spiritcaller Boots
  • Sewing Machine
Yellow 320Grey 330
Spiritcaller GreavesTaught by Pattern: Spiritcaller Greaves, requires 300
Unrevealed item #273939
  • Sewing Machine
Yellow 320Grey 330
Spiritcaller TreadsTaught by Pattern: Spiritcaller Treads, requires 300
Unrevealed item #273935
  • Sewing Machine
Yellow 320Grey 330
Wildstalker's GreavesTaught by Pattern: Wildstalker's Greaves, requires 300
Unrevealed item #273903
  • Sewing Machine
Yellow 320Grey 330
Black Dragonscale BootsTaught by Pattern: Black Dragonscale Boots, requires 300
Black Dragonscale BootsYellow 320Grey 340

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