Inverted image in microscope

The inverted image on your microscope is caused by only having one lens on magnification, the convex magnificaton with the concave eyepeice causes the light to be fliped, accually, that's the way your eye recives it, it accually would be right-side up if your eye didn't flip it.

If you're talking about the color, then that's a totally different story, its mainly because that your eye(or camera) is too close to the light and it can only see it in odd ways, since the light is coming from the bottom of the specimen, it seems to make them look all black, so that also adds to the strange effect. Hope that answers your question.