Seen them at Foto Impex since I started using Film in 2015 (againish). Not exactly new. When I looked at their stuff then, it was various recycled film, like sound recording film. A bit fascinating when I was new in this film world. But now, I have no more interest. Certainly better than Bubble Film with static discharge patterns.
I wish Foto Impex would move these experimental things into their own section, so they won't break up browsing through proper film offerings.