Asphaltum and bitumen are broad terms for a wide range of substances based on high-molecular hydrocarbons. From the viewpoint of current art historical research, bitumen represents a large group of organic substances.
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Asphaltum and Bitumen in Art: Historical Insight and Modern Uses by George O'Hanlon
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Asphaltum and Bitumen in Art: Historical Insight and Modern Uses by George O'Hanlon