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What is In a high copper amalgam, the phase which is eliminated is: and explain in detail?
A reaction between Cu3 Sn (ε phase) and γ2 occurs and yields Cu6Sn5  (η phase). Because of the low copper content, a majority of γ2 remains. The addition of more than 6% of copper by weight can reduce or eliminate the γ2 phase by the formation of Cu-Sn phase.
Reference: PHILLIPS’ SCIENCE OF DENTAL MATERIALS, 12th ed page no 344