Karl Knappe’s “Hagar,” a bronze from 1923, twisted like knotted rope, has been left with its green patina of rust and rubble, making it almost impossible to decipher, save as evidence of its fate.
Karl Knappe的“夏甲”，一个1923年的铜质雕像，扭曲得像一股纠缠在一起的绳子，布满了铜锈和碎石瓦砾，几乎不可能辨认出来，但却像命中注定般作为往事的见证而被拯救了出来。
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In order to obtain rust, brown, gun-black and ancient green films on brass at room temperature, the chemical coloring process on brass in acid solution was studied.