lighting material back front

[qwertyuiop]

Hello, I have a problem with back and front of my polygons. When I set the GL_FRONT on my polygon with color red and I rotate, both sides are red.

and when I set GL_BACK none of the sides is red.

I need this to be able to check how to face the polygons right...or I know how to do it but I cant see any difference at this point becouse of the problem with front and back.

It should be just to set glNormal3f  to a direction and that will be fron, right?

plz help=) thx!