Dental Greening occurring when porcelains are fired on silver free alloys may be attributed to A Vaporization of silver from the walls of contaminated furnaces B Surface diffusion of silver from the marginal metal C More rapid silver diffusion in sodium containing glass D Silver ionization by porcelains with high oxygen potential 💡 Explanation Greening occurring when porcelains are fired on silver free alloys may be attributed to ✓ Correct Answer: A. Vaporization of silver from the walls of contaminated furnaces