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a) Pictures of fresh and aged FASnI3 solutions in DMSO before and after the addition of SnF2 in 10 mol %; the respective 119Sn‐NMR spectra of b) fresh and c) aged solutions; d) 119Sn‐NMR spectra of SnF2, SnI2, SnF4 and SnI4 in DMSO. Further information about solution preparation in Figure S3. 119Sn‐NMR spectra and solution pictures of the mixing of e) 2× SnI2 and SnF4 and f) 2× SnF2 and SnI4. The signal magnification was adapted accordingly for illustrative purposes.
