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a) Fresh and aged solutions of FASnI3 in DMSO with 10 % SnF2, SnCl2, SnBr2 and SnI2. An arrow points out the difference in darkening as an effect of the ageing treatment. 119Sn‐NMR spectra of b) 10 % SnF2‐ and c) 10 % SnCl2‐containing FASnI3 solution before and after being aged. SnF4 and SnCl4 solutions spectra are added as indicative of the species formed under the ageing process.
