What is mean by dross defect in casting process?

Dross defect in the casting process refers to the presence of unwanted impurities or waste materials that can form on the surface of molten metal during casting. This can occur due to oxidation, contamination, or the presence of slag, leading to a rough or flawed surface on the finished product. Dross can compromise the mechanical properties and aesthetic quality of the casting, necessitating careful management and removal during production. Proper processing techniques and quality control measures are essential to minimize dross formation.