Just a FYI for smiths:
1 Rusty Spear + 1 Sharpening Stone = 1 Tarnished Spear.
1 Tarnished Spear + 1 Flask of Water = 2 Pieces of Ore.
I will pass on more recipes if I find any on other Rusty Weapons.
By the way, Tarnished weapons dont sell for more, but they have a smaller delay between attacks, at least on Stromm in Queynos.