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Asphaltum Definition
Asphaltum is a paint-on-acid-resistant varnish that is a byproduct of tar. It is used to protect metal plates from the mordant. In lithography, to chemically process the drawing, asphaltum is used.
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Ashlar Ashcan School Ascender Asbestos As Is Asphaltum Asprey Assemblage Sculpture Assessment Asturian Art Asuka