Polaroid 612

Got my hands on a pack of Polaroid 612 from a tutor at uni, it has an iso of 20,000 and went out of date in 1996. It was supposedly made for use in medical equipment and telescopes but I thought I'd try shooting it at night, pretty much all the pictures came out like the one below. I thought they were overexposed so I didn't expose the last one to light at all but it came out the same.