In time, the SAWA fire pit will be beautifully rust-red as it is created from 100% corten steel. The product is always delivered in the steel's original gray color, but over time when it is exposed to moisture, wind and varying climates, an even and dense oxide layer will form on the steel's surface. How fast it goes varies depending on where you live. On the west coast in Sweden, you see a change after maybe a week.