  We introduce a Raman profiling method to track homogenization of
Ge$_x$Se$_{100-x}$ melts in real time, and show that 2 gram melts reacted at
950{\deg}C in high vacuum homogenize in 168 hours on a scale of 10{\mu}m.
Homogenization of melts is precursive to self-organization of glasses. In the
present glasses, compositional variation of Raman active corner-sharing mode
frequency of GeSe$_4$ units, molar volumes, and the enthalpy of relaxation at
Tg, reveal the rigidity (xc(1)= 19.5(3)%) and the stress (xc(2) = 26.0(3)%)
transitions to be rather sharp ({\Delta}x < 0.6%). These abrupt elastic phase
transitions are intrinsic to these materials and have a direct bearing on
physics of glasses.
