SN Model 1. Selected colors of the cloud. The (green) V − J curves split after ~30 days. The upper branches, which have the larger scatter, give the true model results, in the lower ones, the dust radiation at J has been subtracted. They would apply if the luminosity or the dust evaporation temperature were lower. But the latter would also imply a smaller inner shell radius R₁ (see Fig. 2) if we stick to R₁ = R_ev.