Revolog / Dubblefilm films are experimental, fun films which are handmade using 35mm colour / b&w negative films ranging from 200-400 ISO. The process varies with each different type, and the effects varies randomly.
35mm colour-negative film
36 exposures - 200 ISO
Plexus film shows an organic looking, bluish structure that reminds of a neural net or underwater reflections.
The effect is visible on the whole photograph and is stronger in darker parts of the image.
There's something alien to this effect, so you could use this film for fashion shoots with a science fiction look or simulate being underwater.