Five objects with kinks in their tails that start to deviate from the assumed decline rate at ∼200–250 d post peak are shown in magnitude space as a function of days since peak. As most of these objects have their peak magnitude blinded, no scaling is shown. A normal radioactive decay model was fitted to these tails, shown as solid straight lines with their 1σ uncertainty as dashed regions. But as the ejecta opacity changes over time so does the half-life time of the tail, causing a kink seen in the bins which is not reproduced by the model. The arbitrarily normalised R-band light curve of SN 2011fe (known not to have CSM interaction from detailed spectral studies) (Zhang et al. 2016) is shown in blue, showing the same shift in decline slope at a similar phase.