Understand crystallization, kinetics and optimize reaction variables of biphasic and multiphasic reactions with the high-performance, best-in-class, compact ReactRaman Raman Spectrometer paired with iC Raman that provides critical insight even for the most challenging reactions. ReactRaman Spectrometer works in a wide range of chemistries in which the molecule is Raman active, the chemistry is in solution, multiphasic or solids, and the concentration is higher than ~0.1 %.