Early Bronze Age metalworkers observed porosity increase during mold-casting impure copper. Which mechanism reduced voids using charcoal?

💡 Explanation

Charcoal reduces porosity via carbon monoxide scavenging; because molten copper absorbs hydrogen readily, the charcoal produces CO which reacts with and removes dissolved hydrogen, therefore, reducing gas bubble formation, rather than altering melt convection or solidification parameters.

• Which consequence arises in medieval glassblowing, specifically crafting lenses, with insufficiently cooled glass during annealing?
• Which risk increased during the Bronze Age when casting intricate figurines using the lost-wax process?
• During the construction of Byzantine mosaics, which consequence arises from insufficient keying?
• Which outcome resulted from the interaction between powder and crossbows?
• Which outcome affected Mesoamerican agriculture when early maize varieties faced limitations in nitrogen uptake from soil?
• Which risk increased due to thermal expansion when crafting large Byzantine mosaics on exterior surfaces?