Longer press times alone may not be practical to achieve "full" density since densification rates saturate as  approaches 0.99 (see Figure and Table ), giving diminishing transparency increases over extending pressing time frames. From a historical perspective, the development of near full density ceramics has required intimate knowledge and control of underlying sintering mechanism(s). There is currently a knowledge gap within the literature in this regard for halide perovskites materials, which needs to be closed in order to optimize their densities and thus transparency. This can be accomplished by classical uniaxial or isostatic pressing experiments that track densification kinetics through changes in the microstructural properties (e.g.,  and dg) as a function of temperature, pressure, and starting powder grain size or purity. These kinetic measurements can be used to derive the rate-controlling sintering mechanism(s) as well as associated activation energies under various conditions. This underlying mechanistic knowledge can in turn be exploited to outline optimal starting powder properties as well as both green and white body pressing conditions to make ceramics with ideal properties for a given application.