JC was one of the first alloys developed by Jensen Industries more than 20 years ago. A high noble, yellow crown and bridge alloy, it's perfect for most cast-gold restorative work including single and partial crowns, onlays, and short-span bridges. JC offers a vivid yellow "18 carat" color and features 78% nobility. It's strong and melts, casts, finishes and polishes with ease and accuracy.