‘...and take pics of the other side “
But it is dark on the back side, not enough light, even with Tri-X (pushed?)
#12 Tri-X
I haven’t thought of that for decades. I use to develop the B&W film for astrophotography at home. Now you just point a digital camera at the night sky and get far better images in 30 seconds let alone several minutes with just a camera.
http://www.clarkvision.com/articles/do_you_need_a_modified_camera_for_astrophotography/