Red gold color change can occur after pickling, altering the appearance of finished jewelry with unexpected yellowish stains. This case study explains how acid treatments can selectively remove copper from the surface and modify the alloy color. Read the full analysis to learn how to prevent this defect.
Gas porosity from investment reaction can severely affect the surface quality of cast gold components and generate defects that are difficult to remove during finishing. This case study explains how investment quality, storage conditions and burnout cycles influence gas formation during casting. Read the full analysis to discover how to prevent these defects.
Shrinkage cavity wire casting defects can cause unexpected wire breakage during rolling, drawing and finishing operations. This case study explains how machine stoppages in fast wire casting promote shrinkage cavity formation and create weak sections within the wire. Read the full analysis to learn how to prevent these failures.
Shrinkage porosity in gold casting can compromise the quality of finished jewelry and generate surface defects that are difficult to remove. This case study explains how gating design, feeder sizing and casting temperatures influence metal solidification and defect formation. Read the full analysis to discover how to reduce shrinkage porosity and improve casting quality.
Fire stain in silver alloys can cause dark surface stains that are difficult to remove and can compromise the appearance of finished jewelry. This case study explains how post-casting cooling conditions influence copper oxidation and why flask quenching plays a key role in preventing the defect. Read the full analysis to learn how to avoid fire stain.
Investment inclusions in casting can create visible surface defects that compromise the quality of finished jewelry. This case study explains how mold degradation, improper burnout cycles and poorly prepared wax patterns can lead to investment particles becoming trapped in the metal. Read the full analysis to learn how to prevent these defects.
Hard spots from metal contamination can compromise surface quality and generate defects that become visible only after finishing. This case study explains how impurities introduced through raw materials, scrap reuse or production equipment can trigger hard spot formation in gold alloys. Read the full analysis to discover how to prevent contamination and protect product quality.