Black and white reversal processing?

Hardly. It’s a primitive film, primitive in the first sense, the coating is not hardened or only little, there is no backing whatsoever.

I have always liked this simple stock. I got beautiful images on Fomapan R 100 out of my Eyemo 71. To reverse-process 35-mm. film in 100 foot length is a joy. To project it is irreplaceable.