The liquid‐glass transition in calcium potassium nitrage (CKN), salol, and aqueous LiCl solution was investigated by laser light scattering spectroscopy. Combining data obtained with a Sandercock tandem Fabry Perot interferometer and a Spex tandem Raman spectrometer provided spectra spanning more than four decades in frequency. The data was analyzed to test both qualitative and quantitative predictions of the mode coupling theory of the glass transition, and produced generally excellent agreement. For CKN, we found that the MCT crossover temperature Tcis ∼378K, 45° above Tg.