| Epoch | B-V |
| SN 2000fr | |
| -7.97 | -0.06 |
| -3.51 | -0.14 |
| 4.60 | -0.12 |
| 12.93 | 0.24 |
| 20.31 | 0.61 |
| 30.22 | 0.99 |
| SN 1999ff | |
| -7.99 | 0.03 |
| 1.91 | -0.02 |
| 1.98 | 0.10 |
| 2.91 | 0.23 |
| 19.55 | 0.71 |
| 28.75 | 1.22 |
|
a The data are not included in the analysis because they are out of the range in which Nobili et al. (2003) studied colour correlations. |