Waxed Oxidized Cut Copper is the final, wax-sealed stage of the Cut Copper weathering cycle, permanently teal with green spots and immune to further color change. Four Blocks of Copper arranged in a 2x2 crafting pattern yield 4 Cut Copper, and the same pattern with 4 Waxed Oxidized Copper blocks yields 4 Waxed Oxidized Cut Copper. A Stonecutter turns just 1 Waxed Oxidized Copper into the same 4 Waxed Oxidized Cut Copper instead. Applying Honeycomb to Oxidized Cut Copper seals it into Waxed Oxidized Cut Copper on the spot. Waxed Oxidized Cut Copper needs at least a Stone Pickaxe to mine and drops nothing without one. Waxed Oxidized Cut Copper stacks to 64 and generates naturally inside Trial Chambers alongside Waxed Cut Copper.

Waxed Oxidized Cut Copper is renewable, because copper ingots drop from Drowned, so builders can always craft more Blocks of Copper to keep the teal shade coming. A Stonecutter turns 1 Waxed Oxidized Cut Copper into 2 matching slabs, 1 matching staircase, or 1 Waxed Oxidized Chiseled Copper without wasting material on a crafting grid. Because the waxed finish blocks any further change, Waxed Oxidized Cut Copper keeps its aged, teal patina forever, unlike unwaxed Oxidized Cut Copper, which an axe or a lightning strike can still reset to an earlier weathering stage.