Porosity Revealed by Blue Epoxy Impregnation

Interpartical and intraparticle porosity filled with blue epoxy. This is how it should look if a good job was done.
Intraparticle (bryozoan) porosity filled with blue epoxy. The dye mixture in the epoxy is weak.
Interparticle porosity filled with blue epoxy which has large clear pockets within (P). This happens fairly often. Do not miss identify the clear epoxy patch for a quartz grain.