It's more practical to ask what we
don't merchant.
99% of the time white and blue items are merchant (with the exception of some very rare skins).
95% of the time purple items are merchant.
Any gold item with a good damage mod and max damage are usually reliable to sell to players. Gold items with good weapon mods are good for salvaging.
It's best just to hang around the
Price Check forum and learn from there.
