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In Vatican architecture, gold can be as thin as a sheet suspended in the air and still produce a monumental effect. The technique known as gold leaf transformed domes and walls into surfaces of light, making visible a central idea of Christianity: eternity. Gold leaf is an ultra-thin sheet of pure gold — generally 22 to 24 karats — obtained through a traditional process of progressive hammering until it reaches microscopic thickness. It can measure less than one micron thick