Question

What determines the color of a colored object?

Answer 1

We know each color is associated with particular wavelength and each wavelength. Each object is made of by atoms.

Atoms have electronic arrangment. When atom absorbs radiation there is excitation in electrons when these electrons come back to ground state they emit the light radiations. This emission depends upon the arrangement of electrons in the atom.

emitted light radiation have different color range.

so the color of the colored object depends upon the electronic arrangement in the atom.