Reflection of color in opaque and transparent materials

AbsoluteZer0

Hi,

The textbook I am using does not clearly explain why certain objects reflect certain frequencies of color.

If the frequency of light matches the frequency of the opaque object it is shined upon, will it be absorbed or reflected? I'm thinking that it may be absorbed for the same reason that ultraviolet light is not able to be transmitted through glass, because the vibrating frequency of ultraviolet light matches the natural frequency of glass. Does this mean that if the frequency of light is less than or greater than that of some object, it will be reflected?

What about transparent objects? What causes some colored light to be absorbed while the others are transmitted? With blue glass for example, is it because the natural frequency of the glass matches that of blue light? or is it something else?

Thanks,