Defects, the scourge of the metalcaster. These can be as simple as broken or loose sand, or more complicated like gas bubbles. In any case, it doesn t look good, and it may make the casting useless. Now, I m pretty good at casting , so I don t make many mistakes. but here s one that got by me: Flash This casting shows a very common defect, flash. This is where the mold somehow seperated enough to allow metal between the halves, along the parting line. (See also the trivet for more flash.) You can see the inside circle here is nearly completely filled in with flash. .
