Taken on photopaper instead of film. No development stage. With a long enough exposure, photopaper reveals a negative. Scanned on a flatbed, and inverted.
Exposure time was around five minutes if I can remember. Probably a little less than that.
The sunglasses I'm wearing are actually custom made 52mm filter rings with polarizers screwed on.
You can see a duplicate of them where my arms cross because I triggered the shutter, ran into place, and then put them on. Hence, they got some exposure time just sitting on the bench.
The photopaper is more responsive to UV light than visible light. This makes focusing a real hassle. I'm still in the process of determining how much to offset the viewfinder or the film to compensate for the UV focal point.