Colour evolution of SN 2019odp and the comparison objects. The top panel shows the g − r colour (or corresponding Johnson colour). The lower panel shows the r − i colour (or corresponding Johnson colour). For each transient, we sampled 1000 realisations of the supernova light curve from the interpolation kernel. For SN 2019odp, we also included synthetic photometry based on the observed spectra as a consistency check (using the same filter curve as for the photometric dataset). They are denoted with black crosses.