Greening occuring when porcelains are fired on silver free alloys may be attributed to________________?
Correct answer: A. Vaporization of silver from the walls of contaminated furnaces
- 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
Green discoloration can result from silver contamination released from the walls of a furnace previously used with silver-containing alloys. The silver vapour or deposits contaminate the porcelain during firing even when the current alloy is silver-free.
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