The Exposed Copper Bars is the second oxidation stage of the Copper Bars, showing a slightly faded copper hue with light green spots as the surface begins to weather. It functions the same as other copper bar variants and serves as a decorative and semi-transparent block used for barriers, windows, and architectural accents. Like its iron counterpart, it connects seamlessly to adjacent bars, solid blocks, and fences, allowing for versatile building designs.

The Exposed Copper Bars is obtained by allowing regular Copper Bars to oxidize naturally over time or by using one directly in its exposed form through creative mode. Players can preserve its current appearance by applying Honeycomb to create a Waxed Exposed Copper Bars, preventing further oxidation, or restore it to an earlier stage using an axe. With a hardness of 5 and a blast resistance of 6, the Exposed Copper Bars combines durability with a lightly aged copper look, making it ideal for builders seeking subtle weathering in their copper structures.