Special Tinkering
From Drunkapedia
Related topics: Salvaging
Some types of salvage do not require a trained skill to apply, anyone can apply and there is no skill check (though the in game message can imply there is) and no chance of failure.
Crafted Salvage
Salvaged Ivory
Salvaged Leather
Salvaged Silk
Sandstone Salvage
Rare Salvage
