Rapid tissue processor

Use of a microwave unit for processing a tissue specimen of less than about three millimeters for histology, the microwave unit comprising: (a) a source which generates microwave radiation as a form of energy, (b) a waveguide transmitting microwave radiation, and (c) a first reaction chamber which receives the microwave radiation, wherein at least a first chemical composition and the tissue specimen in contact therewith they are surrounded within walls of the first reaction chamber; wherein the microwave radiation is transmitted from the source to the first reaction chamber by the waveguide, the first chemical composition is brought from a first storage chamber to the first reaction chamber and the tissue sample hardens least initially by the first chemical composition, microwave radiation, or both, wherein the first reaction chamber comprises a mode whispering gallery that provides a uniform temperature inside it substantially distribution due to the energy of the microwave radiation.