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