I'm making my way through Haist right now and I think I've read enough to actually formulate a question now. Haha. Is two electron sensitization a process by where you can make a latent image site with two as opposed to three photoelectrons? Or is it something else? Am I right in saying that to make a development site, you need at least three photons? I find it fascinating that film was/is such a huge industry and yet we don't actually know the mechanics of how the latent image is actually formed. Has more work been done in this area that postdates Haist? Or is it still up in the air? I guess if we don't know exactly how it works by now, we probably never will, given the decline of film.