I fired my kiln last weekend and got my new test glazes with the red clay. The firing went fine, no problems. Here is a photo of the cone pack after firing. You can see that the cones melted in comparison with the earlier photo. http://anneinclayland.blogspot.com/2010/02/studio-time.html
The glazes on the red clay look different than they do on the white clay. That is what I wanted to know! I am glad the firing went well, I just wish I had made better tiles for testing glazes. I guess I wasn't really thinking ahead when I made the tiles. Oh well, they work for what I need them to. Here is a photo of the glazes on the red clay.
And compare to some of the same glazes on the white clay: