Voila un post d´un des forums de bioware:
Ok this is a list of distillables
Faint = 4 Ranks
Weak = 6 ranks
Glowing = 8 ranks
Radiant = 10 ranks
Shadow Reaver Bones (8 ranks) also give a random glowing or radiant elemental essence.
AIR
Faint:
Bat tooth
Weak:
Ghoul Claws
Wraith Residue
Wyvern Scales
Glowing:
Ghast Claws
Ghost Residue
Radiant:
Lich Dust
Shadow Residue
EARTH
Faint:
Dire Boar Tusk
Skeleton Rib
Stag Beetle Horn
Weak:
Bear claw
Beetle Gland
Gargoyle Horn
Glowing:
Blade Spider Leg
Dire Bear Claw
Radiant:
Iron Golem Fragments
FIRE
Faint:
Demon Blood (8 rank)
Devil Blood (8 rank)
Imp Stinger
Weak:
Fire Beetle Belly
Fire Mephit Hide
Glowing:
Hellhound Tooth
Vampire Tooth
Radiant:
Fire Giant Head
POWER
Faint:
Bladeling Spike
Ghoul Claws (6 rank)
Umber Hulk Mandible (6 rank)
Weak:
Ghast Claws (8 rank)
Troll Blood
Wraith Residue
Glowing:
Demon Blood
Devil Blood
Ogre Mage Skull
Phase Spider Mandible
Shadow Reaver Bones
Vampire Tooth
Radiant:
Dragon Blood
Lich Dust
WATER
Faint:
Dire Wolf Tooth
Weak:
Ice Mephit Hide
Spider Venom Gland
Troll Blood
Umber Hulk Mandible
Glowing:
Bugbear Tusk
Phase Spider Mandible
Winter Wolf Pelt
Radiant:
Frost Giant Head