When Gold fused with porcelain is fired at very high temperature greenish discoloration of cervical margin is due to________________?

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 copper

(D) Formation of excess oxides

Submitted By :Ali Uppal

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