Dental When gold fused with porcelain is fired at very high temperature, greenish discoloration of cervical margin is due to: A High firing temperature B Disintegration of opaque layer C Presence of silver D Formation of excess oxides 💡 Explanation When gold fused with porcelain is fired at very high temperature, greenish discoloration of cervical margin is due to: ✓ Correct Answer: C. Presence of silver