A casting indication is the beginning of an investigation, not a complete explanation. Similar-looking surface problems can originate in different stages of investment casting. Effective defect analysis connects appearance, location and production history before selecting corrective action.

Porosity describes voids, but it does not identify a single mechanism. Gas-related porosity and shrinkage-related porosity call for different investigations. The appearance of an indication is useful evidence, yet its position and relationship to the manufacturing route are equally important.