金箔 (gold leaf) is a thin layer of gold that is often used for decorative purposes. It is made by hammering gold into extremely thin sheets, which can be as thin as 0.1 micrometers. This delicate material is commonly used in art, architecture, and crafts, adding a luxurious touch to various items. In traditional Japanese culture, 金箔 is frequently applied to temples and shrines, enhancing their beauty and significance. It is also used in calligraphy and ceramics, showcasing the skill of artisans. The use of gold leaf dates back thousands of years and continues to be appreciated for its aesthetic appeal.