Porosity in amalgam increases because of all except-
Porosity can be expected and increased by undertrituration, undercondensation, irregularly shaped particles of alloy powder, miscalculated diameter varieties of powder particles to occupy available spaces, insertion of too large increments into the cavity preparation, delayed insertion after trituration or a generally non-wetting, non-plastic mass of amalgam.
Reference: Marzouk Operative dentistry, pg-109
Undertrituration
Undercondensation
Regularly shaped particles
Insertion of too large increment