unfortunately, it isn't easy to recreate instant film when all the previous components are not available, or supposedly 'patented'.
Polaroid DID make b&w integral film for a couple years, but even they weren't able to provide good quality results;; the film would fade and bubble after a few days.
the px-films suffer from a couple different elements, the biggest being light, temperature and humidity.
Heat causes the photo to get red/orange.
The photo should also stay in a dark place while developing. The opacification layer on the film will cause some parts to get re-exposed to light.
When storing them, you should prevent keeping them in humid places. If the film stays to moist, there are crystals that begin to form.
Impossible is aware of the problems and is not presenting the film as the best thing they can make. It's just going to take a little bit longer than the "one year" that they gave themselves to create a product for us.
The color film is being released july 29, and is less sensitive to the problems that exist with the px films. They hope to recreate the color scheme of time-zero, though the film looks similar to the Artistic TZ film.
I think a lot of people thought the film was going to be just where Polaroid left off or something... that IS impossible...
I am impressed that they were able to create something like this is such a short period of time. So many people want to argue and complain about it not reaching their expectations, but the film is being improved constantly, this is just the beginning...