Why do aqueous solutions of Cr^(2+) usually appear violet instead of blue?

${\left[C r {\left(O {H}_{2}\right)}_{6}\right]}^{2 +}$ as far as I know is a beautiful blue salt. In solution, partial oxidation to ${\left[C r {\left(O {H}_{2}\right)}_{6}\right]}^{3 +}$ occurs which is red-violet in colour. So the colour you see is the result of $C {r}^{2 +} \left(a q\right)$ and $C {r}^{3 +} \left(a q\right)$ ions..........