Table 4: The correlations between V-I colour index and R magnitude, for the eight blazar objects.
Source $\Delta R$ N r Probs.

3C 66A

 0.50 120 0.511 $7.34 \times10^{-10}$
PKS 0420-01 1.48 55 -0.388 $2.62 \times10^{-3}$
S5 0716+71 1.37 271 0.438 $1.11 \times10^{-14}$
PKS 0735+17 0.54 38 0.111 $4.97 \times10^{-1}$
OJ 287 1.40 29 0.354 $4.99 \times10^{-2}$
3C 345 0.55 22 -0.009 $9.66 \times10^{-1}$
BL Lac 1.05 53 0.657 $1.33 \times10^{-8}$
3C 454.3 0.93 48 -0.837 $1.07 \times10^{-16}$


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