The website for the Impossible Project, attempting to re-formulate and re-start production of Polaroid 600 integral film, has been updated. The most interesting update is a request for help sourcing a particular type of latex to use as a timing layer. There's a diagram on the website of the film layers, as well as a cryptic (to me) discussion of the chemistry. I'm be interested in the comments of photo chemistry experts here as to what they can glean from the I.P.'s request.