Carbon-13 radiofrequency amplification by stimulated emission of radiation (C-13 RASER) is demonstrated on a bolus of liquid hyperpolarized ethyl [1-13C]acetate, as reported by Thomas Theis, Eduard Y. Chekmenev et al. in their Communication (e202215678). Spontaneous RASER signal emissions were detected using a 1.4 T NMR spectrometer equipped with a standard radiofrequency detection coil for over three minutes. RASER detection enables new detection schemes for 13C-hyperpolarized contrast agents and particular new opportunities for next-generation molecular imaging on clinical MRI scanners.