 Spontaneous X-ray emission from Germanium. Collapse models not only forbid macroscopic superpositions to be stable, they share several other features which are forbidden by the standard theory. One of these is the spontaneous emission of radiation from otherwise stable systems, like atoms. While the standard theory predicts that such systems—if not excited—do not emit radiation, collapse models allow for radiation to be produced, as a consequence of the interaction between the system and the noise responsible for the collapse. The emission rate has been computed for free charged particles (Fu 1997; Adler, Bassi, &amp; Donadi 2013), an harmonic oscillator (Bassi &amp; Donadi 2014; Donadi, Deckert, &amp; Bassi 2014) and for hydrogenic atoms (Adler et al. 2007). A formula for the radiation emission from a generic system is given in (Donadi &amp; Bassi 2014). The theoretical predictions are compatible with current experimental data (Fu 1997). At any rate, the importance of such experiments lies in the fact that—so far—they provide the strongest upper bounds on the collapse parameters (Adler &amp; Bassi 2007). But this is not the whole story: very recently (Curceanu, Hiesmayr, &amp; Piscicchia 2015; Curceanu, Bartalucci, et al. 2016; Piscicchia et al. 2017), following this line of research, it was proven experimentally that the proposal by Adler (2007) of a drastic change of the frequency of the localizations with respect to those of the original GRW paper is definitely incompatible with the experimental data, unless the CSL model is modified by taking a non-white noise (which is actually a reasonable assumption, if the noise is physical). 