Exposed Film for Flash trigger
what is an alternative for covering the flash to use as a trigger?
Film days are over, so I don't know where one can get exposed 35mm film strip.
Well, there are still a few labs around that are processing E6 film, so you should find somebody to approach, even if it is a matter of sending a few emails (and fluttering your metaphorical eyelashes in an effective manner??)
I found this outfit here in UK by searching Google "E6 processing"..
Please note, the film type you need is UN-exposed E6 transparency, but processed out to BLACK . Having found your lab, it isn't hard to come by. There is a short length of this "leader" film trimmed from each 35mm film that's processed. It is a waste product routinely disposed of, so it is just a matter of taking some from the bin and popping it in an envelope to you...
... which self-addressed/stamped envelope could have originated with you in the first place, I'm thinking.... (???)
It works well, BTW.