<prompt> In a high copper amalgam, the phase which is eliminated is:Gamma 1Gamma 2Gamma 1 and 2No phase is eliminated  <response>: 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 