In ${\displaystyle {\left[Ti{\left(H_{2}O\right)}_6\right]}^{+3}}$ complex the energy absorbed for excitation of ${\displaystyle 3d^1}$ electron is

The colour of ${\left[\mathrm{Ti}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{+3}$ is violet, however it can turn colourless when heated. The complex's violet color is caused by electron transfer from the t₂g to the eg. When an unpaired electron goes from the t₂g level to the eg level, it absorbs yellow light and reflects violet light. This is why it seems aggressive in colour.