What items turn into what when you salvage them?
As of Patch 2.0, all items level 1-60 now salvage into Common Debris (for white and grey items), Exquisite Essences (for blue items), Iridescent Tears (for yellow items), or Fiery Brimstones (for legendary items). Any of the old crafting items you had were converted into their equivalent new item.
Items from level 61-70 turn into Reusable Parts, Arcane Dust, Veiled Crystals, and Forgotten Souls for white, blue, yellow, and legendary items, respectively.
Additional information on the RoS materials. While materials from 1-60 items are not account bound, RoS materials from 61-70 are account bound.
The most common way these are used is in crafting or enchanting, mostly the latter.
As of the most recent patch 2.1 all blue (magic), yellow (rare), and white/gray (normal) items may each be salvaged as a group in your current inventory at the blacksmith.