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It’s called cobblestone because it’s made of stones that are “cobbed” together. A cob is a term that refers to rounded lumps. Originally, cobblestone streets were made from pebbles and stones gathered from riverbeds that had been rounded over time by the passage of water. The term has nothing to do with a cobbler, which is the term for someone who makes and fixes shoes.

Brick and stone are durable, low-maintenance materials for siding and walls that offer excellent insulation, aesthetic appeal, and can increase property value.

To stain brick, you should use a product specifically formulated for brick, concrete, or other masonry surfaces. These stains are designed to penetrate the porous surface of the brick and bond with it. This is different from paint, which sits on the surface and is prone to peeling, flaking, and trapping moisture that can cause damage. Water-based brick stains are often recommended because they are easy to apply, even for DIYers, and they allow the brick to breathe. Avoid using regular paint on brick, as it will not adhere properly and can lead to future maintenance problems.

In some cases, black stains on brick are caused by organic substances like algae and mold. However, it's more likely that the black spots you're noticing on your bricks come from carbon from vehicle exhaust or soot. Black stains can usually be removed by scrubbing the brick with a brush and masonry cleaner or power washing.