Oxidized Copper Trapdoor is the final oxidized stage of the copper trapdoor, featuring a teal-green appearance. It can be opened and closed manually without redstone and is craftable from oxidized copper ingots. It also generates naturally in trial chambers in its waxed form.

Oxidized copper trapdoors can be mined only with a stone pickaxe or better. They function like other trapdoors, allowing manual interaction or control via redstone signals. They are also affected by wind bursts from wind charges.

Since it is fully oxidized, it no longer changes over time. However, oxidation can be removed with lightning or by right-clicking while crouching with an axe. To prevent deoxidation, players can apply honeycomb to create a waxed Oxidized Copper Trapdoor.