Yeah wyote is right.
A lesson on lights and colors. (Because I felt like researching this stuff.)
Why is a mirror reflecting?
Because the material in the mirror(not the glass but the silver or whatever you are using lets just say silver) has a high reflecting property. The exact reason for the propert goes into optical physics which I don't know. This high reflecting property and the fact that the silver is smooth makes the light bounce off the silver, and this is why a mirror reflects.
Why is there glass in a mirror?
Early mirrors actually didn't have glass in them. The glass just acts as something to protect the silver and hold it into place.
Why is something a certain color?
The reason something is a color is because it has a low reflecting property and it has pigments within it. So an obect that is red means that that objects has a pigment for all forms of light except red, and the red light is reflected back at your eyes which see it as red.
So with all this information I would conclude that a mirror has no color. I wouldn't say it is the color of the object it reflects because really that is the color of the object, not the mirror. But if you could give me some reasons why it could be the color of what it reflects, I would probably agree easily.
This site had some cool things on light and the atomosphere and such. http://apollo.lsc.vsc.edu/classes/met130/notes/chapter4/reflection.html