These salvages never had a use before Dekarutide, but can now be used to change the current element of your item to a different element.
You cannot change the element of an item to something it’s not capable of having. (i.e. altering a Cestus to do Pierce damage)
Damage bonuses found on wands, bows, etc. will adhere to the new element – however, it will not change any properties such as Resistance Cleaves or Rends already on it.
The overall chance of success depends on the workmanship of the salvage and the craft of the item.
Obsidian
Material ID == 69
Changes item element to Bludge
Yellow Garnet
Material ID == 48
Changes item element to Slash
White Jade
Material ID == 45
Changes item element to Pierce
Serpentine
Material ID == 71
Changes item element to Acid
Tiger Eye
Material ID == 42
Changes item element to Fire
White Quartz
Material ID == 46
Changes item element to Frost
Amethyst
Material ID == 12
Changes item element to Lightning