Dynamic light scattering experiments performed on precrystalline liquid solutions that shows oiling-out at higher vanillin concentration resulted in scattering from assumed precrystalline clusters. The structures appear during crash-cooling into the supersaturated area and grow to mm size. They decrease in size and number at the appearance of visible crystals and might be unstable amorphous phases or or precrystalline structures that fit into the classical theory of crystallization. The data presented explains as to why the temperature-time history influences the behavior of crystallization and shows that structures can coexist with the oiling-out phenomena, but not as a direct part of it.