Only one lab creating Polaroid materials and that's in Enschede, The Netherlands. So, buy a box from sleezebay for a song and your firstborn and have someone tear one of the pods apart and perform analysis. Or, just buy some and have fun, knowing it is in limited supply until The Impossible Project decides it is viable and profitable to make it themselves as they have some of the packfilms. Or, yeah, there's another. Email Impossible and see if they might have some materials/reference literature that they might be willing to share.